在iOS 3.2（iPad）中正确显示和关闭全屏MPMoviePlayerController

Question

在iOS 3.2（iPad）中正确显示和关闭全屏MPMoviePlayerController

iphonecocoa-touchipadmpmovieplayercontrollerios

22

我在iPad应用程序中尝试显示全屏电影并允许用户使用播放控制器上的“完成”按钮或“退出全屏”按钮来关闭它时遇到了很多麻烦。

起初，我使用 MPMoviePlayerViewController 作为电影播放器，但是我没有收到其 MPMoviePlayerController 对象的进入/退出全屏的通知，所以我改为自己实现。

我能够使电影全屏显示（虽然过渡效果不太好），但是当按下“完成”或“退出全屏”按钮时，播放器没有任何反应。我在下面发表了我的代码：

- (void)startPlayingMovieWithURLString:(NSString *)movieURLString {
    // I get all of these callbacks **EXCEPT** the "willExitFullScreen:" callback.
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willEnterFullScreen:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willExitFullScreen:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didFinishPlayback:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];

    [self.moviePlayerController setContentURL:someExistingURL];

        // "self" is a UIViewController subclass, and is presented as a "fullscreen" modal view controller from its parent
        // I'm setting the movie player's view's frame to take up the full rectangle of my view controller, but really I want the movie to be completely removed when the user presses "done" (that is, removed from the view hierarchy). Not sure when/where to do this.
    self.moviePlayerController.view.frame = self.view.frame;
    [self.view addSubview:self.moviePlayerController.view];
    [self.moviePlayerController setFullscreen:YES animated:YES];

}

这里是我的didFinish回调函数的代码

- (void)didFinishPlayback:(NSNotification *)notification {
        // This ends up recursively telling the player that playback ended, thus calling this method, thus…well you get the picture.
        // What I'm trying to do here is just make the player go away and show my old UI again.
    [self.moviePlayerController setFullscreen:NO animated:YES];
}

很明显我做错了什么，但我已经查阅了文档，却不知道该如何让电影消失。我认为它应该比这更直观。我做错了什么？

- jbrennan

2个回答

0

是的。太好了。上面确实提到了通知...

然而，不知何故没有 MPMoviePlayerPlaybackWillFinishNotification！！！这真的是个问题。

当您将电影播放器调用为模态（无论使用 presentViewController/presentModalViewController/presentVideoController 中的哪一个方法），如果您定义了.fullScreen = YES，则不应该在所有情况下调用 MPMoviePlayerWillExitFullscreenNotification 通知（显然，因为它不考虑我们进入/退出全屏，而只是呈现/解除控制器）。

但是，确实没有任何通知表明视频即将完成并关闭。这是必要的（除了可能发生的任何其他情况），以捕获开始解除的时刻。（当然，在调用 MPMoviePlayerPlaybackDidFinishNotification 之前，过渡已经开始）。同时，在通知之前会为先前显示的控制器调用 application:supportedInterfaceOrientationsForWindow:，并且没有办法告诉 AppDelegate 我们当前的控制器必须以另一种方向显示。

因此，由于我的视频是全屏且没有任何控件显示（这是一种介绍方式，所以我只需要等到它完成），我的解决方案就是设置一个计时器，每隔短时间（0.1秒）检查视频当前位置...如果接近结尾，那么这就是我自己通知的时刻。

- Agat

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可以查看英文原文，
原文链接

- Art Gillespie · Accepted Answer

以下是事件通知的工作原理：

用户点击“完成”按钮
- MPMoviePlayerWillExitFullscreenNotification
- MPMoviePlayerDidExitFullscreenNotification
用户在传输控件上点击“退出全屏”按钮
- MPMoviePlayerWillExitFullscreenNotification
- MPMoviePlayerDidExitFullscreenNotification
- 请注意，播放不会停止
电影播放结束
- MPMoviePlayerPlaybackDidFinishNotification 并且 MPMoviePlayerPlaybackDidFinishReasonUserInfoKey 被设置为 MPMovieFinishReasonPlaybackEnded
- 如果你在这个通知中从 MoviePlayerController 实例调用 setFullscreen:NO animated:YES，那么你将会获得 WillExit 和 DidExit 通知。
- 请注意，当用户点击“完成”或“退出全屏”按钮时，你不会收到 PlaybackDidFinish 通知。

因此，通常情况下，如果你想要摆脱 MoviePlayer 的视图，你需要在 DidExitFullscreen 通知处理程序中添加 [self.moviePlayerController.view removeFromSuperview]。而 WillExitFullscreen 通知则太早了。

下面是我的代码：

- (void)willEnterFullscreen:(NSNotification*)notification {
    NSLog(@"willEnterFullscreen");
}

- (void)enteredFullscreen:(NSNotification*)notification {
    NSLog(@"enteredFullscreen");
}

- (void)willExitFullscreen:(NSNotification*)notification {
    NSLog(@"willExitFullscreen");
}

- (void)exitedFullscreen:(NSNotification*)notification {
    NSLog(@"exitedFullscreen");
    [self.movieController.view removeFromSuperview];
    self.movieController = nil;
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)playbackFinished:(NSNotification*)notification {
    NSNumber* reason = [[notification userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
    switch ([reason intValue]) {
        case MPMovieFinishReasonPlaybackEnded:
            NSLog(@"playbackFinished. Reason: Playback Ended");         
                break;
        case MPMovieFinishReasonPlaybackError:
            NSLog(@"playbackFinished. Reason: Playback Error");
                break;
        case MPMovieFinishReasonUserExited:
            NSLog(@"playbackFinished. Reason: User Exited");
                break;
        default:
            break;
    }
    [self.movieController setFullscreen:NO animated:YES];
}

- (void)showMovie {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willEnterFullscreen:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willExitFullscreen:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(enteredFullscreen:) name:MPMoviePlayerDidEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(exitedFullscreen:) name:MPMoviePlayerDidExitFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];

    NSURL* movieURL =  [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"tron" ofType:@"mov"]];
    self.movieController = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
    self.movieController.view.frame = self.view.frame;
    [self.view addSubview:movieController.view];
    [self.movieController setFullscreen:YES animated:YES];
    [self.movieController play];
}