iphone - 界面旋转期间淡入/淡出

Question

当我的 iPhone 界面旋转时，我想对 UIViewController 的特定 UIView 进行淡入/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];  
}

但是动画在旋转开始之前没有完成(我们可以看到 View 开始自动调整大小)...

有没有办法延迟旋转开始？

“duration”是旋转动画的持续时间，对吧？

Answer 1

我发现运行当前运行循环的时间与前面的动画相同，实际上确实延迟了旋转。

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

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