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    <title>IOS开发 on cubegao</title>
    <link>https://cubegao.com/categories/ios%E5%BC%80%E5%8F%91/</link>
    <description>Recent content in IOS开发 on cubegao</description>
    <generator>Hugo</generator>
    <language>zh-CN</language>
    <lastBuildDate>Mon, 03 Aug 2020 12:10:00 +0800</lastBuildDate>
    <atom:link href="https://cubegao.com/categories/ios%E5%BC%80%E5%8F%91/index.xml" rel="self" type="application/rss+xml" />
    <item>
      <title>给AsyncDisplayKit（Texture）替换网络图片下载缓存框架</title>
      <link>https://cubegao.com/post/2020-08-03-asdk-sdwebimage-kingfisher/</link>
      <pubDate>Mon, 03 Aug 2020 12:10:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2020-08-03-asdk-sdwebimage-kingfisher/</guid>
      <description>&lt;h3 id=&#34;前言&#34;&gt;前言&lt;/h3&gt;
&lt;blockquote&gt;
&lt;p&gt;为了方便管理图片缓存，统一缓存文件夹和缓存方法，将AsyncDisplayKit自带的PINRemoteImage插件，
替换为项目在用的Kingfisher、SDWebImage。&lt;/p&gt;&lt;/blockquote&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-javascript&#34; data-lang=&#34;javascript&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#66d9ef&#34;&gt;import&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;Kingfisher&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 2&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 3&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#a6e22e&#34;&gt;extension&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASNetworkImageNode&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 4&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;static&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;imageNode&lt;/span&gt;() &lt;span style=&#34;color:#f92672&#34;&gt;-&amp;gt;&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASNetworkImageNode&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 5&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASNetworkImageNode&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;cache&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageManager&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;shared&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;downloader&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageManager&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;shared&lt;/span&gt;)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 6&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 7&lt;/span&gt;&lt;span&gt;}
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 8&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 9&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#66d9ef&#34;&gt;class&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageManager&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;NSObject&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageDownloaderProtocol&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageCacheProtocol&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;10&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;11&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;static&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;shared&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;=&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageManager&lt;/span&gt;()
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;12&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;private&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;override&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;init&lt;/span&gt;() {}
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;13&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;14&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#a6e22e&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadImage&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;with&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;url&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;URL&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;DispatchQueue&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadProgress&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageDownloaderProgress&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;completion&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#960050;background-color:#1e0010&#34;&gt;@&lt;/span&gt;&lt;span style=&#34;color:#a6e22e&#34;&gt;escaping&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageDownloaderCompletion&lt;/span&gt;) &lt;span style=&#34;color:#f92672&#34;&gt;-&amp;gt;&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;Any&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;15&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;16&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#a6e22e&#34;&gt;ImageDownloader&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;default&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;downloadTimeout&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;=&lt;/span&gt; &lt;span style=&#34;color:#ae81ff&#34;&gt;30.0&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;17&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;var&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;operation&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;DownloadTask&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;18&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#a6e22e&#34;&gt;operation&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;=&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ImageDownloader&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;default&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;downloadImage&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;with&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;url&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;options&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;progressBlock&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; { (&lt;span style=&#34;color:#a6e22e&#34;&gt;received&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;expected&lt;/span&gt;) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;19&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadProgress&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;!=&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;20&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;async&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;execute&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;21&lt;/span&gt;&lt;span&gt;                    &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;progress&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;=&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;expected&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;==&lt;/span&gt; &lt;span style=&#34;color:#ae81ff&#34;&gt;0&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt; &lt;span style=&#34;color:#ae81ff&#34;&gt;0&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;received&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;/&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;expected&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;22&lt;/span&gt;&lt;span&gt;                    &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadProgress&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;CGFloat&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;progress&lt;/span&gt;))
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;23&lt;/span&gt;&lt;span&gt;                })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;24&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;25&lt;/span&gt;&lt;span&gt;        }) { (&lt;span style=&#34;color:#a6e22e&#34;&gt;result&lt;/span&gt;) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;26&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;switch&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;result&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;27&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;case&lt;/span&gt; .&lt;span style=&#34;color:#a6e22e&#34;&gt;success&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;)&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;28&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;async&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;execute&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; { &lt;span style=&#34;color:#a6e22e&#34;&gt;completion&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;image&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;29&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;ImageCache&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;default&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;store&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;image&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;original&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;originalData&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;forKey&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;url&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;cacheKey&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;toDisk&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;true&lt;/span&gt;)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;30&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;case&lt;/span&gt; .&lt;span style=&#34;color:#a6e22e&#34;&gt;failure&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;error&lt;/span&gt;)&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;31&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;async&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;execute&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; { &lt;span style=&#34;color:#a6e22e&#34;&gt;completion&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;error&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;operation&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;nil&lt;/span&gt;) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;32&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;dPrint&lt;/span&gt;(&lt;span style=&#34;color:#e6db74&#34;&gt;&amp;#34;Job failed: \(error.localizedDescription)&amp;#34;&lt;/span&gt;)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;33&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;34&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;35&lt;/span&gt;&lt;span&gt;        
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;36&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;operation&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;37&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;38&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;39&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#a6e22e&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;cancelImageDownload&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;forIdentifier&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadIdentifier&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;Any&lt;/span&gt;) {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;40&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;task&lt;/span&gt; &lt;span style=&#34;color:#f92672&#34;&gt;=&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadIdentifier&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;as&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;?&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;DownloadTask&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;41&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#a6e22e&#34;&gt;task&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;cancel&lt;/span&gt;()
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;42&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;43&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;44&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;45&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#a6e22e&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;cachedImage&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;with&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;url&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;URL&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;DispatchQueue&lt;/span&gt;, &lt;span style=&#34;color:#a6e22e&#34;&gt;completion&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#960050;background-color:#1e0010&#34;&gt;@&lt;/span&gt;&lt;span style=&#34;color:#a6e22e&#34;&gt;escaping&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASImageCacherCompletion&lt;/span&gt;) {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;46&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#a6e22e&#34;&gt;ImageCache&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;default&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;retrieveImage&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;forKey&lt;/span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;url&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;cacheKey&lt;/span&gt;) { (&lt;span style=&#34;color:#a6e22e&#34;&gt;result&lt;/span&gt;) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;47&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;switch&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;result&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;48&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;case&lt;/span&gt; .&lt;span style=&#34;color:#a6e22e&#34;&gt;success&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;)&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;49&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;callbackQueue&lt;/span&gt;.&lt;span style=&#34;color:#66d9ef&#34;&gt;async&lt;/span&gt; { &lt;span style=&#34;color:#a6e22e&#34;&gt;completion&lt;/span&gt;(&lt;span style=&#34;color:#a6e22e&#34;&gt;value&lt;/span&gt;.&lt;span style=&#34;color:#a6e22e&#34;&gt;image&lt;/span&gt;) }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;50&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;case&lt;/span&gt; .&lt;span style=&#34;color:#a6e22e&#34;&gt;failure&lt;/span&gt;(&lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;error&lt;/span&gt;)&lt;span style=&#34;color:#f92672&#34;&gt;:&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;51&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#a6e22e&#34;&gt;dPrint&lt;/span&gt;(&lt;span style=&#34;color:#e6db74&#34;&gt;&amp;#34;Job failed: \(error.localizedDescription)&amp;#34;&lt;/span&gt;)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;52&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;53&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;54&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;55&lt;/span&gt;&lt;span&gt;}
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-swift&#34; data-lang=&#34;swift&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#66d9ef&#34;&gt;import&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;SDWebImage&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 2&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 3&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#66d9ef&#34;&gt;extension&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASNetworkImageNode&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 4&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;static&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;imageNode&lt;/span&gt;() -&amp;gt; ASNetworkImageNode {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 5&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt; ASNetworkImageNode(cache: ASNetImageManage.shared, downloader: ASNetImageManage.shared)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 6&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 7&lt;/span&gt;&lt;span&gt;}
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 8&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt; 9&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#66d9ef&#34;&gt;class&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;ASNetImageManage&lt;/span&gt;: NSObject, ASImageDownloaderProtocol, ASImageCacheProtocol {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;10&lt;/span&gt;&lt;span&gt;    
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;11&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;static&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; shared = ASNetImageManage()
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;12&lt;/span&gt;&lt;span&gt;    
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;13&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;downloadImage&lt;/span&gt;(with URL: URL, callbackQueue: DispatchQueue, downloadProgress: ASImageDownloaderProgress?, completion: @escaping ASImageDownloaderCompletion) -&amp;gt; Any? {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;14&lt;/span&gt;&lt;span&gt;        
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;15&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;weak&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;var&lt;/span&gt; weakOperation: SDWebImageOperation?
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;16&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; operation = SDWebImageManager.shared.loadImage(with: URL, options: .retryFailed, progress: { (received, expected, url) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;17&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; downloadProgress &lt;span style=&#34;color:#f92672&#34;&gt;!=&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;18&lt;/span&gt;&lt;span&gt;                callbackQueue.async(execute: {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;19&lt;/span&gt;&lt;span&gt;                    &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; progress = expected == &lt;span style=&#34;color:#ae81ff&#34;&gt;0&lt;/span&gt; ? &lt;span style=&#34;color:#ae81ff&#34;&gt;0&lt;/span&gt; : received &lt;span style=&#34;color:#f92672&#34;&gt;/&lt;/span&gt; expected
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;20&lt;/span&gt;&lt;span&gt;                    downloadProgress?(CGFloat(progress))
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;21&lt;/span&gt;&lt;span&gt;                })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;22&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;23&lt;/span&gt;&lt;span&gt;        }) { (cachedImage, data, error, type, unknow, url) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;24&lt;/span&gt;&lt;span&gt;            &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; image = cachedImage {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;25&lt;/span&gt;&lt;span&gt;                callbackQueue.async(execute: { completion(image, &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;26&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;27&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;28&lt;/span&gt;&lt;span&gt;            callbackQueue.async(execute: { completion(&lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;, error, &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;, &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;29&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;30&lt;/span&gt;&lt;span&gt;        weakOperation = operation
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;31&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt; weakOperation
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;32&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;33&lt;/span&gt;&lt;span&gt;    
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;34&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;cancelImageDownload&lt;/span&gt;(forIdentifier downloadIdentifier: Any) {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;35&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; downloadIdentifier = downloadIdentifier &lt;span style=&#34;color:#66d9ef&#34;&gt;as&lt;/span&gt;? SDWebImageOperation {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;36&lt;/span&gt;&lt;span&gt;            downloadIdentifier.cancel()
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;37&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;38&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;39&lt;/span&gt;&lt;span&gt;    
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;40&lt;/span&gt;&lt;span&gt;    &lt;span style=&#34;color:#66d9ef&#34;&gt;func&lt;/span&gt; &lt;span style=&#34;color:#a6e22e&#34;&gt;cachedImage&lt;/span&gt;(with URL: URL, callbackQueue: DispatchQueue, completion: @escaping ASImageCacherCompletion) {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;41&lt;/span&gt;&lt;span&gt;                
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;42&lt;/span&gt;&lt;span&gt;        &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; key = SDWebImageManager.shared.cacheKey(&lt;span style=&#34;color:#66d9ef&#34;&gt;for&lt;/span&gt;: URL) {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;43&lt;/span&gt;&lt;span&gt;            SDWebImageManager.shared.imageCache.queryImage(forKey: key, options: .allowInvalidSSLCertificates, context: &lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;) { (cachedImage, data, type) &lt;span style=&#34;color:#66d9ef&#34;&gt;in&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;44&lt;/span&gt;&lt;span&gt;                &lt;span style=&#34;color:#66d9ef&#34;&gt;if&lt;/span&gt; &lt;span style=&#34;color:#66d9ef&#34;&gt;let&lt;/span&gt; image = cachedImage {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;45&lt;/span&gt;&lt;span&gt;                    callbackQueue.async(execute: { completion(image) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;46&lt;/span&gt;&lt;span&gt;                    &lt;span style=&#34;color:#66d9ef&#34;&gt;return&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;47&lt;/span&gt;&lt;span&gt;                }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;48&lt;/span&gt;&lt;span&gt;                callbackQueue.async(execute: { completion(&lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;) })
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;49&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;50&lt;/span&gt;&lt;span&gt;        }&lt;span style=&#34;color:#66d9ef&#34;&gt;else&lt;/span&gt; {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;51&lt;/span&gt;&lt;span&gt;            callbackQueue.async {
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;52&lt;/span&gt;&lt;span&gt;                completion(&lt;span style=&#34;color:#66d9ef&#34;&gt;nil&lt;/span&gt;)
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;53&lt;/span&gt;&lt;span&gt;            }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;54&lt;/span&gt;&lt;span&gt;        }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;55&lt;/span&gt;&lt;span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;56&lt;/span&gt;&lt;span&gt;    }
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;57&lt;/span&gt;&lt;span&gt;}
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;</description>
    </item>
    <item>
      <title>容易被人忽略的 NSCache</title>
      <link>https://cubegao.com/post/2019-11-11-nscache/</link>
      <pubDate>Mon, 11 Nov 2019 20:13:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2019-11-11-nscache/</guid>
      <description>&lt;p&gt;第一次见到&lt;code&gt;NSCache&lt;/code&gt;，是在&lt;code&gt;SDWebImage&lt;/code&gt;中。&lt;code&gt;SDWebImage&lt;/code&gt;的内存缓存机制就是通过&lt;code&gt;NSCache&lt;/code&gt;完成的。所以可能你不太了解这个类，但是其实一直在使用它。&lt;/p&gt;
&lt;h3 id=&#34;为什么要使用nscache&#34;&gt;为什么要使用NSCache？&lt;/h3&gt;
&lt;p&gt;我们通常用缓存来临时存储短时间使用但创建昂贵的对象。重用这些对象可以优化性能，因为它们的值不需要重新计算。另外一方面，这些对象对于程序来说不是紧要的，在内存紧张时会被丢弃。如果对象被丢弃了，则下次使用时需要重新计算。&lt;/p&gt;
&lt;p&gt;&lt;code&gt;NSCache&lt;/code&gt;是一个可变的集合，主要用来存储&lt;code&gt;key-value&lt;/code&gt;对。它有着和&lt;code&gt;NSMutableDictionary&lt;/code&gt;类似的API。实际上，&lt;code&gt;NSCache&lt;/code&gt;就像是一个会自动移除对象来释放内存的&lt;code&gt;NSMutableDictionary&lt;/code&gt;。&lt;/p&gt;



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&lt;p&gt;&lt;code&gt;NSCahce&lt;/code&gt;与可变集合不同之处：&lt;/p&gt;</description>
    </item>
    <item>
      <title>HTTP 协议中 GET 和 POST 的区别</title>
      <link>https://cubegao.com/post/2019-02-02-get-post/</link>
      <pubDate>Sat, 02 Feb 2019 13:14:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2019-02-02-get-post/</guid>
      <description>&lt;h3 id=&#34;关于http&#34;&gt;关于HTTP&lt;/h3&gt;
&lt;p&gt;&lt;code&gt;HTTP&lt;/code&gt;（超文本传输协议）是一种请求/响应型的协议。&lt;/p&gt;
&lt;p&gt;HTTP的&lt;strong&gt;语法&lt;/strong&gt;大致如下：
客户端给服务端发送的请求，由三部分组成：&lt;strong&gt;请求行，消息报头，消息正文。&lt;/strong&gt;
请求行：&lt;code&gt;Method Request-URI HTTP-Version CRLF&lt;/code&gt;
例如：    &lt;code&gt;GET /form.html HTTP/1.1 /r/n&lt;/code&gt;
服务端给客户端发送的响应，也是三部分组成：&lt;strong&gt;状态行，消息报头，响应正文。&lt;/strong&gt;
状态行：&lt;code&gt;HTTP-Version Status-Code Reason-Phrase &lt;/code&gt;
例如:      &lt;code&gt;HTTP/1.1 200 OK /r/n&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;正写到这里，小A走过来说：&lt;code&gt;Request-URL&lt;/code&gt;，你打错了一个字母？
其实没错！
1.&lt;code&gt;URI&lt;/code&gt;的全称是&lt;code&gt;uniform resource identifier&lt;/code&gt;，统一资源标识符，用来唯一的标识一个资源。
2.&lt;code&gt;URL&lt;/code&gt;的全称是&lt;code&gt;uniform resource locator&lt;/code&gt;，统一资源定位符。用来标识一个资源，还指明了如何定位这个资源。如：&lt;/p&gt;



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&lt;p&gt;3.&lt;code&gt;URN&lt;/code&gt;的全称是&lt;code&gt;Uniform Resource Name&lt;/code&gt;，统一资源名称。通过名称来标识资源。如&lt;/p&gt;



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&lt;p&gt;其中，&lt;code&gt;URL&lt;/code&gt;,&lt;code&gt;URN&lt;/code&gt;是&lt;code&gt;URI&lt;/code&gt;的子集。&lt;/p&gt;</description>
    </item>
    <item>
      <title>聊聊 iOS 中的内存管理</title>
      <link>https://cubegao.com/post/2018-08-23-ios-memory-management/</link>
      <pubDate>Thu, 23 Aug 2018 21:03:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2018-08-23-ios-memory-management/</guid>
      <description>&lt;p&gt;对于开发者来说，内存管理几乎是一个永恒的话题。&lt;/p&gt;
&lt;p&gt;内存管理对于编写出高效率的&lt;code&gt;iOS APP&lt;/code&gt;是非常重要的，这是因为&lt;code&gt;iOS&lt;/code&gt;是多任务系统，在同一时刻可能有多个应用程序共享内存，有时为了使某个任务更好地执行，&lt;code&gt;iOS&lt;/code&gt;系统可能会对其它任务分配的内存进行移动，甚至删除。&lt;/p&gt;
&lt;p&gt;现在被广泛使用的内存管理机制主要有&lt;code&gt;GC&lt;/code&gt;和&lt;code&gt;RC&lt;/code&gt;两种。
&lt;code&gt;GC&lt;/code&gt;：垃圾回收机制，定期查找不再使用的对象，释放对象占用的内存。
&lt;code&gt;RC&lt;/code&gt;：引用计数机制，采用引用计数来管理对象的内存，当需要持有一个对象时，使它的引用计数+1，当不需要再持有一个对象的时候，使它的引用计数-1；当一个对象的引用计数为0时，该对象就会被销毁。&lt;/p&gt;
&lt;p&gt;&lt;code&gt;Objective-c&lt;/code&gt;支持三种内存管理机制:&lt;code&gt;GC,MRC,ARC&lt;/code&gt;。以前&lt;code&gt;MacOS&lt;/code&gt;开发中是支持&lt;code&gt;GC&lt;/code&gt;的，后面引入&lt;code&gt;ARC&lt;/code&gt;后就弃用了&lt;code&gt;GC&lt;/code&gt;机制。&lt;code&gt;iOS&lt;/code&gt;开发中使用的是&lt;code&gt;RC&lt;/code&gt;机制，从&lt;code&gt;MRC&lt;/code&gt;到现在的&lt;code&gt;ARC&lt;/code&gt;。&lt;/p&gt;
&lt;p&gt;###引用计数
可以看我之前的一篇关于&lt;a href=&#34;https://cubegao.com/archives/isa_rc.html&#34;&gt;引用计数&lt;/a&gt;。&lt;/p&gt;
&lt;p&gt;###MRC时代
基本内存管理规则：&lt;code&gt;MRC&lt;/code&gt;下是要严格遵守引用计数内存管理规则。
内存管理模型是基于对象的所有权。任何对象都可以拥有一个或者多个所有者，但是一个对象最少要拥有一个所有者，它才会继续存在。如果对象没有所有者的，它将会被销毁。&lt;/p&gt;
&lt;p&gt;####四条内存管理策略：
1.自己生成的对象，自己持有
&lt;code&gt;alloc/new/copy/mutableCopy&lt;/code&gt;等方法创建的对象，我们自己直接持有，它的&lt;code&gt;RC&lt;/code&gt;初始值为1，我们可以直接使用，不需要使用的时候调用&lt;code&gt;release&lt;/code&gt;释放。&lt;/p&gt;
&lt;p&gt;2.非自己生成的对象，自己也能持有。
不通过上面方法创建的对象，它的&lt;code&gt;RC&lt;/code&gt;初始值也为1，但是我们不能直接使用，要先调用&lt;code&gt;retain&lt;/code&gt;，否则可能会&lt;code&gt;crash&lt;/code&gt;。原因是因为这些方法内部是给对象调用了&lt;code&gt;autorelease&lt;/code&gt;方法，所以这些对象是被添加到了自动释放池中了。&lt;/p&gt;
&lt;p&gt;两种情况，程序没有手动指定&lt;code&gt;@autoreleasepool&lt;/code&gt;，当&lt;code&gt;runloop&lt;/code&gt;迭代结束时，会自动给释放池中的对象调用&lt;code&gt;release&lt;/code&gt;方法。如果我们使用前不进行&lt;code&gt;retain&lt;/code&gt;，刚好&lt;code&gt;runloop&lt;/code&gt;迭代结束，对象的RC从1变成0,然后就被销毁了.我们去访问一个已经被销毁的对象,程序就会&lt;code&gt;crash&lt;/code&gt;。
程序手动指定了&lt;code&gt;@autoreleasepool&lt;/code&gt;，当时出了其作用域，对象会调用&lt;code&gt;release&lt;/code&gt;方法，然后销毁，这个时候使用对象也会&lt;code&gt;crash&lt;/code&gt;。&lt;/p&gt;
&lt;p&gt;3.不再需要自己持有的对象时，释放。
不再需要持有或者使用对象的时候，就调用&lt;code&gt;release&lt;/code&gt;或者&lt;code&gt;autorelease&lt;/code&gt;方法进行释放。&lt;code&gt;rc&lt;/code&gt;变成0时，就会调用&lt;code&gt;dealloc&lt;/code&gt;方法销毁。
&lt;code&gt;release&lt;/code&gt;立马&lt;code&gt;rc-1&lt;/code&gt;，&lt;code&gt;autorelease&lt;/code&gt;加入自动释放池，在合适的时候&lt;code&gt;rc-1&lt;/code&gt;，实际上就是延迟释放。&lt;/p&gt;
&lt;p&gt;4.非自己持有的对象，无需释放。
自己不是持有者，调用&lt;code&gt;release&lt;/code&gt;的话，会&lt;code&gt;crash&lt;/code&gt;。&lt;/p&gt;
&lt;p&gt;####实用的内存管理原则
使用访问器方法可以省略大量的&lt;code&gt;retain&lt;/code&gt;和&lt;code&gt;release&lt;/code&gt;
推荐使用访问器方法设置属性，一个是可以避免忘记写&lt;code&gt;retain&lt;/code&gt;和&lt;code&gt;release&lt;/code&gt;，第二个是触发&lt;code&gt;kvo&lt;/code&gt;
不要在初始化和dealloc中使用访问器方法，原因是在初始化中使用访问器方法，&lt;code&gt;self=[super init]&lt;/code&gt;，首先会调用父类的访问器方法，然后如果子类重写了访问器方法，会去调用子类的访问器方法，而这个时候，子类实际上是没有初始化的，所以会出错。&lt;code&gt;dealloc&lt;/code&gt;实际上是个反向的。就是子类先释放，再去调用父类。就是调用父类的&lt;code&gt;dealloc&lt;/code&gt;时，会调用父类的访问器方法，如果子类重写了该访问器方法，就会去调用子类的访问器方法，但是子类已经释放掉了，也会出错。还有一个原因就是会触发&lt;code&gt;KVO&lt;/code&gt;，在准备释放前，触发了&lt;code&gt;kvo&lt;/code&gt;，即将释放的对象被持有了。就是出现莫名其妙的错误。
推荐使用&lt;code&gt;@autoreleasepool&lt;/code&gt;，虽然&lt;code&gt;mrc&lt;/code&gt;下，可以使用&lt;code&gt;NSautoreleasepool&lt;/code&gt;，但是速度慢很多。
1.写的程序是非&lt;code&gt;UI&lt;/code&gt;框架，比如命令行工具
2.循环创建大量的临时变量。
3.多线程中。比如创建辅助线程。&lt;/p&gt;
&lt;p&gt;###ARC时代
&lt;code&gt;ARC&lt;/code&gt;时代，内存管理基本都交给编译器来处理了，对于开发者来说是十分友好了。
&lt;code&gt;ARC&lt;/code&gt;的编译器有两部分，前端编译器和优化器。前端编译器会对每一个对象插入相应的&lt;code&gt;release&lt;/code&gt;语句。类拥有的对象会在&lt;code&gt;dealloc&lt;/code&gt;中释放。方法内创建的对象，前端编译器会在方法末尾自动插入&lt;code&gt;release&lt;/code&gt;语句销毁它。优化器负责移除多余的&lt;code&gt;retain&lt;/code&gt;和&lt;code&gt;release&lt;/code&gt;操作语句。&lt;/p&gt;
&lt;p&gt;但是还是有些地方需要注意的。&lt;/p&gt;
&lt;p&gt;新增的几个关键字：
&lt;code&gt;__strong&lt;/code&gt; 强引用,用来保证对象不会被释放。
&lt;code&gt;__weak&lt;/code&gt; 弱引用 释放时会置为nil
&lt;code&gt;__unsafe_unretained&lt;/code&gt; 弱引用  可能不安全，因为释放时不置为nil。悬垂对象。
&lt;code&gt;__autoreleasing&lt;/code&gt; 对象被注册到&lt;code&gt;autorelease pool&lt;/code&gt;中方法在返回时自动释放。&lt;/p&gt;
&lt;p&gt;####block使用中出现循环引用&lt;/p&gt;



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&lt;/div&gt;
&lt;p&gt;使用weakSelf结合strongSelf的情况下，能够避免循环引用，也不会造成提前释放导致block内部代码无效。
在MRC下，应该使用__block。&lt;/p&gt;</description>
    </item>
    <item>
      <title>聊聊 isa 和引用计数</title>
      <link>https://cubegao.com/post/2018-05-03-isa-rc/</link>
      <pubDate>Thu, 03 May 2018 12:43:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2018-05-03-isa-rc/</guid>
      <description>&lt;p&gt;大家都知道内存管理是通过引用计数管理对象的生命周期。&lt;/p&gt;
&lt;p&gt;那&lt;code&gt;isa&lt;/code&gt;和引用计数又有什么关系呢？先留着疑问。&lt;/p&gt;
&lt;p&gt;###isa指针&lt;/p&gt;



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    &lt;/svg&gt;
  
&lt;/div&gt;
&lt;p&gt;通过注释和代码不难发现，我们创建的一个对象或实例其实就是一个&lt;code&gt;struct objc_object&lt;/code&gt;结构体。&lt;/p&gt;</description>
    </item>
    <item>
      <title>在 Centos7.2 上安装编译 Swift</title>
      <link>https://cubegao.com/post/2018-03-30-installing-and-compiling-swift-on-centos7-2/</link>
      <pubDate>Fri, 30 Mar 2018 16:10:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2018-03-30-installing-and-compiling-swift-on-centos7-2/</guid>
      <description>&lt;p&gt;由于想用Swift写服务玩玩，准备在Centos7.2上部署一个Swift环境，能跑一下Perfect。&lt;/p&gt;
&lt;p&gt;由于Docker的种种好处，当然是选择它来部署Swift环境。&lt;/p&gt;
&lt;h3 id=&#34;安装docker&#34;&gt;安装Docker&lt;/h3&gt;
&lt;h4 id=&#34;更新yum包到最新如果是生产机器务必慎重更新内核避免出现不必要的问题&#34;&gt;更新yum包到最新。&lt;code&gt;如果是生产机器务必慎重更新内核，避免出现不必要的问题。&lt;/code&gt;&lt;/h4&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# yum update&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;h4 id=&#34;执行-docker-安装脚本&#34;&gt;执行 Docker 安装脚本。&lt;/h4&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# curl -fsSL https://get.docker.com/ | sh&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;h4 id=&#34;启动-docker-进程&#34;&gt;启动 Docker 进程。&lt;/h4&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# service docker start&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;h4 id=&#34;验证-docker-是否安装成功并在容器中执行一个测试的镜像&#34;&gt;验证 docker 是否安装成功并在容器中执行一个测试的镜像。&lt;/h4&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# docker run hello-world&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;2&lt;/span&gt;&lt;span&gt;Hello from Docker!
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;p&gt;大概两三分钟就安装好了，国内的服务器可能要用镜像加速会好点。&lt;/p&gt;
&lt;h3 id=&#34;安装swift&#34;&gt;安装Swift&lt;/h3&gt;
&lt;h4 id=&#34;拉取swift的镜像到本地&#34;&gt;拉取Swift的镜像到本地。&lt;/h4&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# docker pull swift&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;p&gt;镜像拉取成功后就可以使用docker images列出当前我们拉取到本地的所有镜像：&lt;/p&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre tabindex=&#34;0&#34; style=&#34;color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;&#34;&gt;&lt;code class=&#34;language-bash&#34; data-lang=&#34;bash&#34;&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;1&lt;/span&gt;&lt;span&gt;&lt;span style=&#34;color:#f92672&#34;&gt;[&lt;/span&gt;root@fadaixiaohai ~&lt;span style=&#34;color:#f92672&#34;&gt;]&lt;/span&gt;&lt;span style=&#34;color:#75715e&#34;&gt;# docker images&lt;/span&gt;
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;2&lt;/span&gt;&lt;span&gt;REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;3&lt;/span&gt;&lt;span&gt;swift               latest              934835f58041        &lt;span style=&#34;color:#ae81ff&#34;&gt;3&lt;/span&gt; weeks ago         1.3GB
&lt;/span&gt;&lt;/span&gt;&lt;span style=&#34;display:flex;&#34;&gt;&lt;span style=&#34;white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f&#34;&gt;4&lt;/span&gt;&lt;span&gt;hello-world         latest              f2a91732366c        &lt;span style=&#34;color:#ae81ff&#34;&gt;4&lt;/span&gt; months ago        1.85kB
&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;p&gt;我们都知道，操作系统分为内核和用户空间。对于 Linux 而言，内核启动后，会挂载 root 文件系统为其提供用户空间支持。而 Docker 镜像（Image），就相当于是一个 root 文件系统。&lt;/p&gt;</description>
    </item>
    <item>
      <title>利用 Travis CI 自动构建 Github Pages</title>
      <link>https://cubegao.com/post/2018-02-06-travis-ci/</link>
      <pubDate>Tue, 06 Feb 2018 19:54:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2018-02-06-travis-ci/</guid>
      <description>&lt;p&gt;###背景&lt;/p&gt;
&lt;p&gt;每次写完&lt;code&gt;blog&lt;/code&gt;,都要在本地&lt;code&gt;hexo&lt;/code&gt;环境编译，等编译完成后，再&lt;code&gt;push&lt;/code&gt;到&lt;code&gt;github&lt;/code&gt;，重复的动作，浪费的时间。&lt;/p&gt;
&lt;p&gt;懒惰是互联网进步的第一动力！我能不能每次写完&lt;code&gt;md&lt;/code&gt;，直接&lt;code&gt;push&lt;/code&gt;到&lt;code&gt;github&lt;/code&gt;，然后它自动编译，编译完成后，自己&lt;code&gt;push&lt;/code&gt;到仓库主分支呢？肯定是可以的，答案就是使用&lt;code&gt;Travis CI&lt;/code&gt;自动构建工具。&lt;/p&gt;
&lt;p&gt;###关联Github和Travis CI
&lt;code&gt;Github&lt;/code&gt; 有提供一个 &lt;code&gt;Personal access tokens&lt;/code&gt;，这个 &lt;code&gt;Token&lt;/code&gt; 与 账号密码 以及 &lt;code&gt;SSH Keys&lt;/code&gt; 同样具有 &lt;code&gt;Github &lt;/code&gt;写入能力。&lt;/p&gt;
&lt;p&gt;前往 &lt;code&gt;Github&lt;/code&gt; 帐号 &lt;code&gt;Settings&lt;/code&gt; 页面，在左侧选择 &lt;code&gt;Personal Access Token&lt;/code&gt;，然后在右侧面板点击 &lt;code&gt;“Generate new token”&lt;/code&gt; 来新建一个 &lt;code&gt;Token&lt;/code&gt;。需要注意的是，创建完的 &lt;code&gt;Token&lt;/code&gt; 只有第一次可见，之后再访问就无法看见（只能看见他的名称），因此要保存好这个值。
&lt;img alt=&#34;333123.jpg&#34; loading=&#34;lazy&#34; src=&#34;https://cubegao.com/images/2020/05/4152391612.jpg&#34;&gt;&lt;/p&gt;
&lt;p&gt;###登录Travis CI关联对应项目
首先打开官方网站 &lt;code&gt;travis-ci.org&lt;/code&gt;，然后使用&lt;code&gt; Github&lt;/code&gt; 账号登入 &lt;code&gt;Travis CI&lt;/code&gt;，然后 &lt;code&gt;Travis&lt;/code&gt; 中会列出你&lt;code&gt; Github&lt;/code&gt; 上面所有的仓库，以及你所属于的组织。&lt;/p&gt;
&lt;p&gt;然后，勾选你需要 &lt;code&gt;Travis&lt;/code&gt; 帮你自动构建的仓库，打开仓库旁边的开关，打开以后，&lt;code&gt;Travis &lt;/code&gt;就会监听这个仓库的所有变化了。
![E1BF98EB2CB8D8E4E6E1F6E8E3BDC5EA.jpg][2]&lt;/p&gt;
&lt;p&gt;###travis.yml配置
原理就是监控对应的文件,有&lt;code&gt;push&lt;/code&gt;就开始构建。&lt;/p&gt;



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&lt;/div&gt;
&lt;p&gt;###Build Config&lt;/p&gt;</description>
    </item>
    <item>
      <title>读源码之 SDWebImage</title>
      <link>https://cubegao.com/post/2017-11-02-sdwebimage/</link>
      <pubDate>Thu, 02 Nov 2017 18:51:00 +0800</pubDate>
      <guid>https://cubegao.com/post/2017-11-02-sdwebimage/</guid>
      <description>&lt;p&gt;###背景
&lt;code&gt;SDWebImage&lt;/code&gt;是&lt;code&gt;iOS&lt;/code&gt;开发过程中最常使用的一个网络图片库，包括图片的下载和缓存。&lt;/p&gt;
&lt;p&gt;主要提供的功能如下：&lt;/p&gt;
&lt;p&gt;1.提供&lt;code&gt;UIImageView&lt;/code&gt;, &lt;code&gt;UIButton&lt;/code&gt;,&lt;code&gt; MKAnnotationView&lt;/code&gt; 的分类，用来加载网络图片，并进行缓存管理;
2.异步方式来下载网络图片
3.异步方式: &lt;code&gt;memory&lt;/code&gt; (内存)＋ &lt;code&gt;disk&lt;/code&gt; (磁盘) 来缓存网络图片，&lt;code&gt;LRU&lt;/code&gt;自动管理缓存;
4.后台图片解码,转换及压缩;
5.同一个 &lt;code&gt;URL&lt;/code&gt; 不会重复下载;
6.失效的 &lt;code&gt;URL&lt;/code&gt; 不会被无限重试;
7.支持 &lt;code&gt;GIF&lt;/code&gt;动画 及&lt;code&gt; WebP&lt;/code&gt; 格式;
8.使用 &lt;code&gt;GCD &lt;/code&gt;和 &lt;code&gt;ARC&lt;/code&gt;;
9.开启子线程进行耗时操作，不阻塞主线程;&lt;/p&gt;
&lt;p&gt;###入口部分
在使用&lt;code&gt;SDWebImage&lt;/code&gt;的时候，入口如下：&lt;/p&gt;



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&lt;/div&gt;
&lt;p&gt;点进去，可以看到下面这些方法：&lt;/p&gt;</description>
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