界面旋转期间的淡入/淡出

Question

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

- (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(我们可以看到视图开始自我调整大小)......

有没有办法延迟旋转开始？

"持续时间"是旋转动画的持续时间,对吧？

Answer 1

我发现当前运行循环运行的时间与前一个动画相同,确实延迟了旋转.

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

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