beginAppearanceTransition

参考原文:https://www.cnblogs.com/hualuoshuijia/p/6845636.html
基本用法为

[self beginAppearanceTransition:YES animated:NO];//调用viewWillAppear
[self  endAppearanceTransition];//调用viewDidAppear
[self beginAppearanceTransition:NO animated:NO];//调用viewWillDisappear

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