UIAlertView,ActionSheet 选择之后调用rootViewController报错

获取rootViewController 的两种方式分别是：

UIViewController *root=  [[UIApplication sharedApplication] keyWindow].rootViewController;

AppDelegate appdelegate=(AppDelegate)[UIApplication sharedApplication].delegate;
UIViewController *rooViewController= [appdelegate window].rootViewController;

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当UIAlertView ,ActionSheet 代理方法之后调用1.root 对象UIApplicationRotationFollowingController，2. rooViewController依然是你设置的windows.rootViewController