IOS9之前，ios播放视频文件一般使用 MPMoviePlayerViewController 和 MPMoviePlayerController。
前者继承自UIViewController，后者继承NSObject。MPMoviePlayerViewController里面包含了一个MPMoviePlayerController。
要想使用上述两者，首先要包含 #import头文件和MediaPlayer.framework。
MPMoviePlayerViewController中只有三个方法和一个属性：
//初始化
- (instancetype)initWithContentURL:(NSURL *)contentURL
//把这个VC Present出来
- (void)presentMoviePlayerViewControllerAnimated:(MPMoviePlayerViewController *)moviePlayerViewController
//把这个VC dismiss掉
- (void)dismissMoviePlayerViewControllerAnimated
//包含的MPMoviePlayerController
@property (nonatomic, readonly) MPMoviePlayerController *moviePlayer;
从根本意义上来说，MPMoviePlayerViewController的方法实现的就是MPMoviePlayerController中的对应初始化，加入视图的方法，前者只是对后者进行了一个简单的封装。
如果要对播放视频的属性进行操作，可以通过设置MPMoviePlayerViewController.moviePlayer来实现。MPMoviePlayerController中可以的修改的参数有很多，详细可以去看官网文档，或者直接从Xcode中直接进mediaPlayer库文件中查看。
以下是关于播放视频的监听事件，注册之后，当对应的状态改变时就可以收到对应的通知
// -----------------------------------------------------------------------------
// Movie Player Notifications
// 当视频缩放比例改变时
NSString * const MPMoviePlayerScalingModeDidChangeNotification
// 当视频播放结束时
NSString * const MPMoviePlayerPlaybackDidFinishNotification
//当用户退出视频时
NSString * const MPMoviePlayerPlaybackDidFinishReasonUserInfoKey
// 当回调状态改变时
NSString * const MPMoviePlayerPlaybackStateDidChangeNotification
// 当网络加载状态改变时
NSString * const MPMoviePlayerLoadStateDidChangeNotification
//当当前播放视频改变时
NSString * const MPMoviePlayerNowPlayingMovieDidChangeNotification
// 当进入全屏或者退出全屏
NSString * const MPMoviePlayerWillEnterFullscreenNotification
NSString * const MPMoviePlayerDidEnterFullscreenNotification
NSString * const MPMoviePlayerWillExitFullscreenNotification
NSString * const MPMoviePlayerDidExitFullscreenNotification
NSString * const MPMoviePlayerFullscreenAnimationDurationUserInfoKey
NSString * const MPMoviePlayerFullscreenAnimationCurveUserInfoKey
// 在appleTv或者音响上播放状态改变时
NSString * const MPMoviePlayerIsAirPlayVideoActiveDidChangeNotification
// 当准备状态改变时
NSString * const MPMoviePlayerReadyForDisplayDidChangeNotification
播放本地路径下的视频的实例代码如下
- (void)Play:(NSString*)resName TypeName:(NSString*)type
{
NSString *path = [[NSBundle mainBundle] pathForResource:resName ofType:type];
if ( nil == path ) {
return;
}
NSURL *url = [NSURL fileURLWithPath:path];
MPMoviePlayerViewController *_moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
_moviePlayer.moviePlayer.controlStyle = MPMovieControlStyleNone;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(movieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:[_moviePlayer moviePlayer] ];
[_moviePlayer.moviePlayer play];
[ [self GetRootViewController] presentMoviePlayerViewControllerAnimated:_moviePlayer];
_moviePlayer = nil;
}
- (void) movieFinishedCallback:(NSNotification*) aNotification
{
MPMoviePlayerController *player = [aNotification object];
[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:player];
[player stop];
[ [self GetRootViewController] dismissMoviePlayerViewControllerAnimated];
}
在IOS9之后，上述的MPMoviePlayerController就被苹果弃用了（不过不影响正常使用）,苹果推荐使用AVPlayerViewController，简而言之就是MPMoviePlayerController使用更简单，功能不如AVPlayer强大，而AVPlayer使用稍微麻烦点，不过功能更加强大。
实例代码
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"backspace" ofType:@"mov"];
NSURL *sourceMovieURL = [NSURL fileURLWithPath:filePath];
AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:sourceMovieURL options:nil];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];
AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
playerLayer.frame = self.view.layer.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
[self.view.layer addSublayer:playerLayer];
[player play];
上方的代码实现的效果其实和MPMoviePlayerController实现的是一样的，AVPlayer更强大的地方是它有对应的方法去调节视频的音量以及视频的进度，可以通过简单的UIslider来实现一个简单的播放器，是不是很酷炫呢！（具体的调节方法请参照苹果API）
