UIViewController 弹出 -> CAAnimation.delegate 未发布？

Question

我在 UINavigationController 上有一个 UIViewController，它有一个特殊的 NSObject，可以在上面执行一些动画。执行动画的方法如下所示：

- (void) animateView:(UIView*) aView toPosition:(CGPoint) aPositionEnd duration:(CGFloat)duration delegate:(id)delegate {

[self.layer addSublayer:aView.layer];
CGPoint aViewPosition = aView.center;
aView.center = OUT_OF_BOUNDS_POSITION; // Make sure this image position is somewhere out of the view
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, aViewPosition.x, aViewPosition.y);
CGPathAddQuadCurveToPoint(path, NULL, aPositionEnd.x, aViewPosition.y, aPositionEnd.x, aPositionEnd.y);

// Uncomment this to draw the path the thumbnail will fallow
// [_mainView setPath:path];

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.path = path;
//pathAnimation.duration = duration;
pathAnimation.removedOnCompletion = NO;

CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
CATransform3D t = CATransform3DMakeScale(0.1, 0.1, 1.0);
scaleAnimation.toValue = [NSValue valueWithCATransform3D:t];
scaleAnimation.removedOnCompletion = NO;

CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
alphaAnimation.toValue = [NSNumber numberWithFloat:0.0f];   
alphaAnimation.removedOnCompletion = NO;

//CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@""];
//CATransform3D t = CATransform3DMakeRotation(degreesToRadian(60.0f) , 1, 0, 0);

CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.animations = [NSArray arrayWithObjects:pathAnimation, scaleAnimation, alphaAnimation, nil];
animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animationGroup.duration = duration;
animationGroup.delegate = delegate;
animationGroup.removedOnCompletion = YES;
[aView.layer addAnimation:animationGroup forKey:nil];

CFRelease(path);

}

'aView' 是 UIImageView，'self' 是 UIViewController，'delegate' 是 NSObject。如果动画完成并且我弹出 UIViewController，一切都很好：animationDidStop:finished: 在 NSObject 中调用，UIViewController 在其 dealloc 中释放 NSObject。但是，如果我在动画发生时弹出 UIViewController，animationDidStop:finished: 会像以前一样被调用，但之后不会释放 NSObject，即使 animationGroup.removedOnCompletion 设置为 YES！这肯定会发生，因为 CAAnimationGroup 没有按照应有的方式释放委托。 （保留了 CAAnimation 代表。）我不知道为什么会这样。有什么想法/建议吗？

也许这在某种程度上与我询问here 的行为有关。 UINavigationController 是不是有问题？

Answer 1

我感觉这更有可能是您对以下两种方法的期望

animationDidStop:finished:

和

removedOnCompletion:

例如，当您弹出视图控制器并且动画仍在运行时，是否将布尔值传递给委托方法 NO？在这种情况下，您不能指望它在完成时被删除，因为您从未给它机会完成。

在这种情况下，您需要使用手动删除动画

removeAllAnimations

在动画仍在运行时弹出视图控制器。

Answer 2

我切换到 addSubview: 而不是 addSublayer: 并且一切正常。