iOS - 使用动画更改 Root View Controller

Question

我正在通过按下一个按钮来更改 Root View Controller ，该按钮连接到我想要更改到的 View Controller 的自定义 segue。自定义转场看起来像:

- (void)perform{
    UIViewController *source = (UIViewController *)self.sourceViewController;
    source.view.window.rootViewController = self.destinationViewController;
}

但这只是立即改变了 Root View Controller 。我希望 Controller 在旧 Controller 之上淡出。

Answer 1

常见的做法是:

    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 View Controller 将以默认方向显示，即纵向。因此，如果您在横向模式下这样做，您的新 View Controller 可能会显示为纵向，然后变为横向。这一行为我解决了这个问题。