ios - MPMoviePlayerController 下一个上一个按钮不正确的通知

Question

我有 MPMoviePlayerController 并且我只想检测下一个/上一个按钮以便相应地播放播放列表，我添加了通知，但它总是返回 MPMoviePlaybackStateStopped 状态而不是MPMoviePlaybackStateSeekingForward 或 MPMoviePlaybackStateSeekingBackward。

代码如下:

[[NSNotificationCenter defaultCenter] addObserver:self // the object listening / "observing" to the notification
                                         selector:@selector(stateChanged:) // method to call when the notification was pushed
                                             name:MPMoviePlayerPlaybackStateDidChangeNotification // notification the observer should listen to
                                           object:nil];

在回调函数中:

-(void)stateChanged:(NSNotification *)notification{
MPMoviePlaybackState state = self.moviePlayerViewController.moviePlayer.playbackState;
switch (state) {
    case MPMoviePlaybackStateStopped:
        NSLog(@"Stopped");
        break;
    case MPMoviePlaybackStateInterrupted:
        NSLog(@"Interrupted");
        break;
    case MPMoviePlaybackStateSeekingForward:
        NSLog(@"forward");
        currentIndex++;
        ForcePlay = true;
        [self PlayVideo:currentIndex];
        break;
    case MPMoviePlaybackStateSeekingBackward:
        NSLog(@"backward");
        currentIndex--;
        ForcePlay = true;
        [self PlayVideo:currentIndex];
        break;
    case MPMoviePlaybackStatePaused:
        NSLog(@"paused");
        break;
    case MPMoviePlaybackStatePlaying:
        NSLog(@"playing");
        break;
}
}

Answer 1

MPMoviePlayerController 的默认控件只有基本功能。点击 Prev/Next 只会调用一个状态，即 MPMoviePlaybackStateStopped。

如果您想要检测上一个/下一个的能力，您必须实现自己的自定义控件并通过使用 MPMovieControlStyleNone 隐藏默认控件来分别对每个按钮执行操作

例如在 Obj-C 中:

[prevBtn addTarget:self action:@selector(onClick:) 
forControlEvents:UIControlEventTouchUpInside];

[nextBtn addTarget:self action:@selector(onClick:) 
forControlEvents:UIControlEventTouchUpInside];