我正在通过按下一个连接到我想要更改为的视图控制器的自定义segue的按钮来更改根视图控制器.自定义segue看起来像：
- (void)perform{
UIViewController *source = (UIViewController *)self.sourceViewController;
source.view.window.rootViewController = self.destinationViewController;
}
但这只会立即更改根视图控制器.我希望控制器在旧控制器之上淡出.
解决方法
常见的方法是：
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"YourSBName" bundle:nil];
UIViewController *vc = [sb instantiateInitialViewController];// Or any VC with Id
DictateITAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
appDelegate.window.rootViewController = vc; // PLEASE READ NOTE ABOUT THIS LINE
[UIView transitionWithView:appDelegate.window
duration:INTERVAL_DURATION
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{ appDelegate.window.rootViewController = vc; }
completion:nil];
现在有几点说明：
appDelegate.window.rootViewController = vc; // PLEASE READ NOTE ABOUT THIS LINE
您实例化的新视图控制器将以默认方向显示,即纵向.因此,如果您在横向中执行此操作,则新视图控制器将显示为纵向,然后转为横向.这条线为我解决了这个问题.
