Play video Files（播放视频）

1。实现:

   导入: #import <MediaPlayer/MediaPlayer.h>

   MPMoviePlayerController:可进行更加全面的视频显示设置,它没使用delegate,而是靠notification system

   MPMoviePlayerViewController:可以放入navigationController,简单实现全屏显示，

                               或是用presentMoviePlayerViewControllerAnimated进行模式窗口全屏显示

e.g.

#import <MediaPlayer/MediaPlayer.h>

#import <AVFoundation/AVFoundation.h>     /* AVAudioSession */

@property (nonatomic, strong)MPMoviePlayerController *moviePlayer;

//监听结束时

- (void) videoHasFinishedPlaying:(NSNotification *)paramNotification{

    /* 找出视频停止播放的原因 */

    NSNumber *reason =  paramNotification.userInfo [MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];   

    if (reason != nil){

        NSInteger reasonAsInteger = [reason integerValue];      

        switch (reasonAsInteger){

            case MPMovieFinishReasonPlaybackEnded:{

                NSLog(@"The movie ended normally");

                break;

            }

            case MPMovieFinishReasonPlaybackError:{

                NSLog(@"An error happened and the movie ended");

                break;

            }

            case MPMovieFinishReasonUserExited:{

                NSLog(@" The user exited the player");

                break;

            }

        }        

        NSLog(@"Finish Reason = %ld", (long)reasonAsInteger);

        [self stopPlayingVideo:nil];

    }   

}

//开始播放视频 

- (void) startPlayingVideo:(id)paramSender{ 

   if (self.moviePlayer != nil){

        [self stopPlayingVideo:nil];

    }

    NSBundle *mainBundle = [NSBundle mainBundle]; 

    NSURL *url = [mainBundle URLForResource:@"Sample"  withExtension:@"m4v"]; 

    self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];  

    if (self.moviePlayer != nil){

        /*监听：结束播放 */

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoHasFinishedPlaying:)

                                  name:MPMoviePlayerPlaybackDidFinishNotification object:self.moviePlayer];       

        NSLog(@"Successfully instantiated the movie player.");      

        /* 播放比例 */

        self.moviePlayer.scalingMode = MPMovieScalingModeAspectFit;     

       [self.view addSubview:self.moviePlayer.view]; //稍后需removeFromSuperview        

        [self.moviePlayer setFullscreen:YES   animated:NO];

        

        /* 当模拟器有声音，真机无声音时 需在启动播放器之前 加上以下这一句 */

       [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

        [self.moviePlayer play];

    } else {

        NSLog(@"Failed to instantiate the movie player.");

    }

}

//停止播放

- (void) stopPlayingVideo:(id)paramSender { 

    if (self.moviePlayer != nil){

        //取消监听

        [[NSNotificationCenter defaultCenter] removeObserver:self 

          name:MPMoviePlayerPlaybackDidFinishNotification  object:self.moviePlayer];       

        [self.moviePlayer stop];      

        [self.moviePlayer.view removeFromSuperview];

    }  

} 

postscript: 

  视频必须是H.264 file format