RootViewController动画过渡，初始方向错误 [英] RootViewController animation transition, initial orientation is wrong

问题描述

所以我按照这个主题： RootViewController切换过渡动画来传递window.rootViewController A到B到C.代码如下所示：

So I followed this thread: RootViewController Switch Transition Animation to transit the window.rootViewController from A to B to C. Code looks like this:

[UIView transitionWithView:self.window 
                  duration:0.5 
                   options: UIViewAnimationOptionTransitionFlipFromLeft 
                animations:^{
                               self.window.rootViewController = newViewController;
                } 
                completion:nil];

问题是我的应用程序只支持格局，但在rootViewController过渡期间，会出现新的视图控制器在纵向模式下比快速旋转到横向模式。

The problem is my app shall only support landscape, but during the rootViewController transition, the new view controller appears in portrait mode than quickly rotate to landscape mode.

我确定：

1. 我为每个viewcontroller设置了UISupportedOrientation为横向（主页按钮右侧）


2. ，在shouldAutoRotateToOrientation方法中，我只设置为横向

可能是另一个原因？

推荐答案

我调查了这个现在，因为我一直在遇到同样的问题。我随机尝试了以下内容，它运行得很好：

I looked into this just now because I kept getting the same issue. I randomly tried the following, and it worked perfectly:

[UIView
    transitionWithView:window 
    duration:0.5
    options:UIViewAnimationOptionTransitionCrossDissolve
    animations:^(void) {
        BOOL oldState = [UIView areAnimationsEnabled];
        [UIView setAnimationsEnabled:NO];
        [(ICApp *)sharedApplication.delegate window].rootViewController = self;
        [UIView setAnimationsEnabled:oldState];
    } 
    completion:nil];

我知道在动画块中禁用/启用动画有点奇怪，但交叉消解动画，旋转没有 - 视图控制器似乎已经旋转并准备好滚动。

I know it's a bit odd to disable/enable animations inside an animation block, but the cross dissolve animates, and the rotation does not -- the view controller appears already rotated and ready to roll.

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