iOS＆gt;可以播放部分下载的视频？

Question

假设我们正在下载一个大型视频 - 它的50Mb - 但到目前为止只下载了25Mb - 是否有可能在完全下载之前开始播放视频？

Answer 1

我假设您正在为视频使用MPMoviePlayerController ......

MPMoviePlayerController有一个loadState属性，您可以使用this notification进行监视。检查视频是否已下载到可播放范围，然后播放。

//Begin observing the moviePlayer's load state.
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerLoadStateChanged:) name:MPMoviePlayerLoadStateDidChangeNotification object:moviePlayer];


- (void)moviePlayerLoadStateChanged:(NSNotification *)notification{
    //NSLog(@"State changed to: %d\n", moviePlayer.loadState);
    if(moviePlayer.loadState == MPMovieLoadStatePlayable && [videoIndicator isAnimating]){
        //if load state is ready to play
        [videoIndicator stopAnimating];//Pause and hide the indicator
        [self.contentView addSubview:[moviePlayer view]];
        [moviePlayer setFullscreen:YES animated:YES];
        [moviePlayer play];//play the video
    }

}

这一点非常重要：如果您要下载超过10分钟的视频，则需要使用HTTP Live Streaming。