我正在制作自定义的进入和退出转换动画，并且遇到了一些问题。我想要的效果是重复 iOS 7 中打开/关闭某个应用程序时出现的深度动画。 我有第一个和第二个控制器。所有动画都在第一个控制器中（它支持UIViewControllerTransitioningDelegate和UIViewControllerAnimatedTransitioning）。所以，我只是在检查：如果正在展示 - 我会执行一个动画（先扩大第一个和第二个视图），如果正在退出 - 我会执行另一个动画（缩小第一个和第二个视图）。展示动画可以正常工作，但是退出动画存在问题。由于某种原因，当我缩小我的第二个控制器（它是UINavigationController）时，我看到黑色背景在它后面（这是错误的，因为我希望在它缩小时看到我的第一个控制器）。以下是来自第一个控制器的代码：
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
UIView *transitionView = [transitionContext containerView];
id toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
id fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
BOOL isPresenting;
isPresenting = [toViewController isKindOfClass:[UINavigationController class]];
UINavigationController *navigator = isPresenting ? toViewController : fromViewController;
if (isPresenting) {
[transitionView addSubview:navigator.view];
navigator.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
navigator.view.alpha = 0;
}
navigator.view.center = self.startButton.center;
void(^AnimationBlock)(void) = ^ {
if (isPresenting) {
navigator.view.transform = CGAffineTransformMakeScale(1, 1);
self.view.transform = CGAffineTransformMakeScale(4, 4);
navigator.view.alpha = 1;
self.startButton.alpha = 0;
} else {
navigator.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
self.view.transform = CGAffineTransformMakeScale(1, 1);
navigator.view.alpha = 0;
self.startButton.alpha = 1;
}
};
[UIView animateWithDuration:1
delay:0.0f
usingSpringWithDamping:50.0
initialSpringVelocity:4
options:UIViewAnimationOptionLayoutSubviews
animations:^{
AnimationBlock();
} completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
if (!isPresenting) {
[navigator.view removeFromSuperview];
}
}];
}
- (void)completeTransitionInContext:(id<UIViewControllerContextTransitioning>)transitionContext{
[transitionContext completeTransition:YES];
}
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
return 1;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
return self;
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
return self;
}