CABasicAnimation 在旋转期间被忽略

Question

我有一个 UIView，它在layoutSubviews 方法中根据 iPad 的方向重新定位其子视图。在layoutSubviews方法中，我有一个CABasicAniamtion，它应该为子视图的重新定位设置动画。动画被设置为特定的持续时间，但该持续时间将被忽略并立即发生重新定位。我知道动画正在触发，因为我看到 AnimationDidStart 和 AnimationDidStop 方法被触发。我知道这与 UIView 的 CALayers 有关，但我在网上找不到任何内容来解释如何解决此问题。任何帮助将不胜感激。

    if([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown)
    {
        NSLog(@"Orientation: Portrait");

        //Hide icon

        CABasicAnimation *iconAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
        iconAnimation.fromValue = [NSValue valueWithCGPoint:[iconImageView center]];
        iconAnimation.toValue = [NSValue valueWithCGPoint:iconThinPosition];
        iconAnimation.duration = 2.7f;
        iconAnimation.autoreverses = NO;
        iconAnimation.repeatCount = 1;
        iconAnimation.delegate = self;
        [iconImageView.layer addAnimation:iconAnimation forKey:@"position"];
        //[iconImageView setCenter:iconThinPosition];

        [iconImageView.layer setPosition:iconThinPosition];
        //[iconImageView setTransform: CGAffineTransformIdentity];

        CABasicAnimation *textAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
        textAnimation.fromValue = [NSValue valueWithCGPoint:[textImageView center]];
        textAnimation.toValue = [NSValue valueWithCGPoint:textThinPosition];
        textAnimation.duration = 2.7f;
        textAnimation.autoreverses = NO;
        textAnimation.repeatCount = 1;
        textAnimation.delegate = self;
        [textImageView.layer addAnimation:textAnimation forKey:@"position"];        
        [textImageView.layer setPosition:textThinPosition];

    }
    else if([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft || [[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight) 
    {
        NSLog(@"Orientation: Landscape");        

        // Show Icon
        CABasicAnimation *iconAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
        iconAnimation.fromValue = [NSValue valueWithCGPoint:[iconImageView center]];
        iconAnimation.toValue = [NSValue valueWithCGPoint:iconShownPosition];
        iconAnimation.duration = 2.7f;
        iconAnimation.autoreverses = NO;
        iconAnimation.repeatCount = 1;
        iconAnimation.delegate = self;
        [iconImageView.layer addAnimation:iconAnimation forKey:@"position"];
        [iconImageView.layer setPosition:iconShownPosition];

        CABasicAnimation *textAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
        textAnimation.fromValue = [NSValue valueWithCGPoint:[textImageView center]];
        textAnimation.toValue = [NSValue valueWithCGPoint:textShownPosition];
        textAnimation.duration = 2.7f;
        textAnimation.autoreverses = NO;
        textAnimation.repeatCount = 1;
        textAnimation.delegate = self;
        [textImageView.layer addAnimation:textAnimation forKey:@"position"];
        [textImageView.layer setPosition:textShownPosition];
    }
}

Answer 1

我想知道它是否没有被忽略，因为当调用您的layoutSubviews 时已经有一个动画事务正在进行中。您可以尝试确认这一点的一件事是覆盖 -didRotateFromInterfaceOrientation 并从那里调用您的layoutSubviews。看看你的观点是否生动起来。

- (void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
//    [self layoutSubviews];
    // Give it a second to settle after the rotation and then call
    // layoutSuviews explicitly.
    [self performSelector:@selector(layoutSubviews) withObject:nil afterDelay:1.0f];
}

另一件需要考虑的事情是，由于您只是对 UIView 图层的位置进行动画处理，因此您可以使用 UIView 动画而不是显式动画。像这样的东西：

    if([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown)
    {
        NSLog(@"Orientation: Portrait");

        //Hide icon
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:2.7f];
        [iconImageView setCenter:iconThinPosition];
        [textImageView setCenter:textThinPosition];
        [UIView commitAnimations];

    }
    else if([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft || [[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight) 
    {
        NSLog(@"Orientation: Landscape");        

        // Show Icon
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:2.7f];
        [iconImageView setCenter:iconShownPosition];
        [textImageView setCenter:textShownPosition];
        [UIView commitAnimations];

    }