This is a network request waiting for the framework, the framework to increase the dynamic effect, convenient and fast, a line of code can be used.
这是一个等待网络请求的框架，目前掘金、饿了么、京东等都是用类似效果。该框架增加了动态效果，方便快捷，一行代码即可快速使用。
开始遮挡
[DWLoadingShimmer startCovering:self.view];
停止遮挡
[DWLoadingShimmer stopCovering:self.view];
Questions, comments, issues, and pull requests welcomed!!
Dwyane
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