界面旋转期间的淡入/淡出 [英] Fade-in / fade-out during an interface rotation

问题描述

当我的iPhone界面旋转时，我想为UIViewController的特定UIView做淡入/淡出......就像......

When my iPhone interface rotates, I would like to do a fade-in/fade-out for a specific UIView of a UIViewController... Like...

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3];
    theView.alpha = 0;
    [UIView commitAnimations];
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{   
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3];
    theView.alpha = 1;
    [UIView commitAnimations];  
}

但动画在旋转开始之前没有完成（我们可以看到查看开始自我调整大小）...

But the animation doesn't finish before the rotation start (we can see the view starting to self-resize)...

有没有办法延迟轮换开始？

Is there a way to delay rotation start ?

持续时间是旋转动画的持续时间，对吗？

"duration" is the duration of the rotating animation, right ?

推荐答案

我发现运行当前运行循环的数量相同时间作为前面的动画，确实延迟了旋转。

I found that running the current run loop for the same amount of time as the preceding animation, did in fact delay the rotation.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    [UIView animateWithDuration:0.25 animations:^{
        theview.alpha = 0.0;
    }];

    [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.25]];
}

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