Question

我想在presentViewController期间制作动画：

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *toView = toVC.view;
    UIView *fromView = fromVC.view;
    UIView* containerView = [transitionContext containerView];
    [containerView addSubview:toView];
    NSTimeInterval duration = 0.35;
    [UIView transitionFromView:fromView toView:toView duration:duration options:(self.reverse?UIViewAnimationOptionTransitionFlipFromLeft:UIViewAnimationOptionTransitionFlipFromRight) | 
    UIViewAnimationOptionAllowUserInteraction completion:^(BOOL finished) {
        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
    }];
}

这在iOS7上工作正常，但iOS8上没有动画。

Answer 1

+transitionFromView:toView:duration:options:completion:负责处理视图层次结构。你不应该[containerView addSubview:toView]。

+transitionFromView:toView:duration:options:completion:的内容中的某处应该是以下代码：

UIView *superview = fromView.superview;
[fromView removeFromSuperview];
[superview addSubview:toView];

您是否尝试删除containerView代码：

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *toView = toVC.view;
    UIView *fromView = fromVC.view;
    NSTimeInterval duration = 0.35;
    [UIView transitionFromView:fromView toView:toView duration:duration options:(self.reverse?UIViewAnimationOptionTransitionFlipFromLeft:UIViewAnimationOptionTransitionFlipFromRight) | 
    UIViewAnimationOptionAllowUserInteraction completion:^(BOOL finished) {
        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
    }];
}

Answer 2

尝试为您的代码所在的视图控制器关闭Use Autolayout。它现在应该可以正常工作。这个对我有用。当我为iOS8设置项目时，我的动画被破坏了，但删除Auto Layout允许它们工作。

为什么iOS7的animateTransition中的UIView transitionFromView没问题，但iOS8没有动画

2 个答案: