我正在尝试制作自定义演示动画，但 VC 是一个 MPMoviePlayerViewController。我正在学习本教程:

当我呈现 MPMoviePlayerViewController 时，一切正常。

但是当我忽略它时，简单的方法是:

 - (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed

没有被调用，我做错了什么？

这是代码:

- (IBAction)playButtonTouchedIn:(id)sender {

    NSURL *url = [[NSBundle mainBundle]URLForResource:@"Learn to speak Spanish quickly with funny videos on youtube" withExtension:@"mp4"];

    MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc]initWithContentURL:url];
    player.transitioningDelegate = self;
    player.modalTransitionStyle = UIModalPresentationCustom;
    [player.moviePlayer setShouldAutoplay:NO];
    player.moviePlayer.controlStyle = MPMovieControlStyleNone;
    [self presentViewController:player animated:YES completion:^{
        [player.moviePlayer play];
        player.moviePlayer.controlStyle = MPMovieControlStyleFullscreen;
    }];
}

UIViewControllerTransitioningDelegate 方法:

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:    (UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
    self.presenting = YES;
    return self;
}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
    self.presenting = NO;
    return self;
}

UIViewControllerAnimatedTransitioning 方法

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.7;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
    UIViewController *fromViewController = [transitionContext     viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];


    if (self.isPresenting) {
        [fromViewController.view setUserInteractionEnabled:NO];

        [transitionContext.containerView addSubview:fromViewController.view];
        [transitionContext.containerView addSubview:toViewController.view];

        CGRect startFrame = toViewController.view.frame;
        toViewController.view.frame = (CGRect){CGPointMake(toViewController.view.frame.size.width, 0),startFrame.size};
        [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0f usingSpringWithDamping:0.5f initialSpringVelocity:4.0f options:UIViewAnimationOptionCurveEaseOut animations:^{    
            toViewController.view.frame = startFrame;
        } completion:^(BOOL finished) {
            [transitionContext completeTransition:YES];

            [fromViewController.view setUserInteractionEnabled:YES];
        }];
    }
    else{
        [toViewController.view setUserInteractionEnabled:YES];

        [transitionContext.containerView addSubview:toViewController.view];
        [transitionContext.containerView addSubview:fromViewController.view];

        CGRect finalFrame = (CGRect){CGPointMake(-fromViewController.view.frame.size.width, 0),fromViewController.view.frame.size};
        [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
            fromViewController.view.frame = finalFrame;
        } completion:^(BOOL finished) {
            [transitionContext completeTransition:YES];
        }];
    }
}

我尝试使用自己开发的 View Controller ，效果很好，MPMoviePlayerViewController 也应该如此吗？

最佳答案

我能够让它在解雇时正确设置动画的方法是在调用 [presentingViewController dismissViewControllerAnimated:YES 之前重新设置 transitioningDelegate 和 modalTransitionStyle ];

所以不仅仅是

- (IBAction) closePressed:(id)sender {
    [self.presentingViewController dismissViewControllerAnimated:YES];
}

你会做

- (IBAction) closePressed:(id)sender {
    MPCustomModalTransitionDelegate *delegate = [[MPCustomModalTransitionDelegate alloc]init];
    self.transitioningDelegate = delegate;
    self.modalTransitionStyle = UIModalPresentationCustom;
    [self.presentingViewController dismissViewControllerAnimated:YES];
}

这里的明显区别是添加了一个新的 MPCustomModalTransitionDelegate 类，您需要从 View Controller 中重构它。

关于ios - UIViewControllerAnimatedTransitioning 与 MPMoviePlayerViewController，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21759100/