- (void)beginAppearanceTransition:(BOOL)isAppearing animated:(BOOL)animated __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (void)endAppearanceTransition __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
今天看别人代码，用到这两个函数，这两个函数的是成对出现的，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
原文：http://www.cnblogs.com/hualuoshuijia/p/6845636.html