iOS疯狂详解之 登陆后淡入淡出更换rootViewController

- (void)restoreRootViewController:(UIViewController *)rootViewController

{

typedef void (^Animation)(void);

UIWindow* window = self.window;

rootViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

Animation animation = ^{

BOOL oldState = [UIView areAnimationsEnabled];

[UIView setAnimationsEnabled:NO];

window.rootViewController = rootViewController;

[UIView setAnimationsEnabled:oldState];

};

[UIView transitionWithView:window

duration:0.5f

options:UIViewAnimationOptionTransitionCrossDissolve

animations:animation

completion:nil];

}