IOS系统的四层结构：核心操作系统层：Core OS,核心服务层：Core Services，媒体层：Media，Cocoa Touch层。
使用MediaPlayer：
1.引入MediaPlayer.frame框架，引入头文件#import <MediaPlayer/MediaPlayer.h>
2.通过设置MPMoviePlayerViewController来设置全屏的播放：
MPMoviePlayerController *_moviePlayer;
MPMoviePlayerViewController *_mpMovieViewController;
NSString *filePath = [[NSBundle mainBundle]pathForResource:@"moxue" ofType:@"mp4"];//视频文件路径 _mpMovieViewController = [[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL fileURLWithPath:filePath]];//将路径添加到MPMoviePlayerViewController [_mpMovieViewController.moviePlayer play];//设置moviePlayer播放 [self.view addSubview:_mpMovieViewController.view];//将MPMoviePlayerViewController添加到view上。
3.通过设置MPMoviePlayerController在view上设置播放屏幕的大小：
NSString *filePath = [[NSBundle mainBundle]pathForResource:@"moxue" ofType:@"mp4"];//视频文件路径 _mpMovieViewController = [[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL fileURLWithPath:filePath]];//将路径添加到MPMoviePlayerViewController _moviePlayer = [_mpMovieViewController moviePlayer];//设置播放器 _moviePlayer.view.frame = CGRectMake(50, 100, 300, 200);//设置播放器大小 _moviePlayer.view.backgroundColor = [UIColor redColor];//设置背景颜色 [_moviePlayer play];//播放 [self.view addSubview:_moviePlayer.view];//添加到视图 _moviePlayer.controlStyle = MPMovieControlStyleEmbedded;//控件选择 _moviePlayer.scalingMode = MPMovieScalingModeAspectFit;//屏幕缩放
4.设置播放器的一些监听方法：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notificationObserver:) name:MPMoviePlayerDidEnterFullscreenNotification object:nil];//添加进入全屏的监听 } -(void)notificationObserver:(NSNotification *)info { NSLog(@"%@",info); }
原文：http://www.cnblogs.com/moxuexiaotong/p/4988112.html