SDWebImage+dispatch_async会出现诡异的问题。
记录一下。。。这俩一起用的时候，会出现图片无法加载的问题。。
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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