Question

我正在尝试使用UIToolBar显示BarButtonItems on MPMoviePlayerController。不知道我将如何实现它。

当用户点击UITableView的一个单元格时，我正在尝试播放视频文件。那时我想给用户一个选项，在FB或tweeter上分享视频。

不确定如何在MPMoviePlayerController上显示共享BarButtonItem 。我正在尝试实现类似于iPhone附带的照片应用程序。

任何人都可以帮帮我吗？谢谢！

Answer 1

MPMovieplayer不是出于此目的的正确选择。您可以使用AVPlayer（在AVFoundation.framework下找到）创建一个自定义电影播放器，以满足您的需要。在项目中创建任何普通的ViewController，并添加一个代码如下的AVPlayer：

-(void)viewDidLoad {
//prepare player
self.videoPlayer = [AVPlayer playerWithURL:<# NSURL for the video file #>];
self.videoPlayer.actionAtItemEnd = AVPlayerActionAtItemEndPause;

//prepare player layer
self.videoPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.videoPlayer];
self.videoPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.videoPlayerLayer.frame = self.view.bounds;
[self.view.layer addSublayer:self.videoPlayerLayer];

//add player item status notofication handler
[self addObserver:self forKeyPath:@"videoPlayer.currentItem.status" options:NSKeyValueObservingOptionNew context:NULL];

//notification handler when player item completes playback
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerItemDidReachEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.videoPlayer.currentItem];
}

//called when playback completes
-(void)playerItemDidReachEnd:(NSNotification *)notification {
[self.videoPlayer seekToTime:kCMTimeZero]; //rewind at the end of play

 //other tasks
 }

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:@"videoPlayer.currentItem.status"]) {
    //NSLog(@"player status changed");

    if (self.videoPlayer.currentItem.status == AVPlayerItemStatusReadyToPlay) {
        //player is ready to play and you can enable your playback buttons here
    }
}
}

由于这是普通视图控制器，您可以为其添加工具栏按钮/按钮，进行播放/共享等，并触发播放器操作以及任何其他相关操作，如下所示：

-(IBAction)play:(id)sender {
    [self.videoPlayer play];
}
-(IBAction)pause:(id)sender {
    [self.videoPlayer pause];
}
//etc.

还要确保删除dealloc中的观察者：

-(void)dealloc {
    //remove observers
    @try {
    [self removeObserver:self forKeyPath:@"videoPlayer.currentItem.status" context:NULL];
    }
    @catch (NSException *exception) {}
    @try {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:self.videoPlayer.currentItem];
    }
    @catch (NSException *exception) {}

    //other deallocations
    [super dealloc];
}

有关此流程的更详细和更复杂的说明，请参阅Apple随附指南，here

如何在MPMoviePlayerController上显示工具栏按钮

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