AVPlayer与AVPlayerViewController的使用

一、AVPlayer

AVPlayer是一个可以播放任何格式的全功能影音播放器，使用AVPlayer需导入AVFoundation.h。

1：支持视频格式： WMV，AVI，MKV，RMVB，RM，XVID，MP4，3GP，MPG等。
2：支持音频格式：MP3，WMA，RM，ACC，OGG，APE，FLAC，FLV等。

在开发中，单纯使用AVPlayer类是无法显示视频的，要将视频层添加至AVPlayerLayer中，这样才能将视频显示出来。

AVPlayer并未提供视频操作组件，需用户自定义。

初始化方法

+ (instancetype)playerWithURL:(NSURL *)URL;+ (instancetype)playerWithPlayerItem:(AVPlayerItem *)item;- (instancetype)initWithURL:(NSURL *)URL;- (instancetype)initWithPlayerItem:(AVPlayerItem *)item;

二、AVPlayerLayer

1、初始化方法

// 1、遍历初始化+ (instancetype)layer;// 2、alloc + init// 3、根据播放媒体初始化+ (AVPlayerLayer *)playerLayerWithPlayer:(nullable AVPlayer *)player;

2、常用属性

bounds：设置播放矩形区域；position：设置播放区域中心点位置；videoGravity：设置拉伸模式player：设置播放媒体

三、AVPlayerViewController
使用
iOS9以后支持画中画；

    // 1、获取本地资源地址    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForAuxiliaryExecutable:@"Cat.mp4"]];    url = urlBundle;    // 2、初始化媒体播放控制器    if (_playerViewController) {        _playerViewController = nil;    }    // 3、配置媒体播放控制器    _playerViewController = [[AVPlayerViewController alloc]  init];    _playerViewController.delegate = self;//    _playerViewController.showsPlaybackControls = NO;//    _playerViewController.view.userInteractionEnabled = NO;    // 设置媒体源数据    _playerViewController.player = [AVPlayer playerWithURL:url];    // 设置拉伸模式    _playerViewController.videoGravity = AVLayerVideoGravityResizeAspect;    // 设置是否显示媒体播放组件    // 播放视频    [_playerViewController.player play];    // 设置媒体播放器视图大小    _playerViewController.view.bounds = CGRectMake(0, 100, 320, 400);    _playerViewController.view.center = self.view.center;        // 推送至媒体播放器进行播放//     [self presentViewController:_playerViewController animated:YES completion:nil];//     直接在本视图控制器播放    [self addChildViewController:_playerViewController];    [self.view addSubview:_playerViewController.view];    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(moviePlayDidEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

属性说明

@interface AVPlayerViewController : UIViewController@property (nonatomic, strong, nullable) AVPlayer *player;@property (nonatomic) BOOL showsPlaybackControls;@property (nonatomic, copy) NSString *videoGravity;@property (nonatomic, readonly, getter = isReadyForDisplay) BOOL readyForDisplay;@property (nonatomic, readonly) CGRect videoBounds;//定制自己的展示View@property (nonatomic, readonly, nullable) UIView *contentOverlayView;@property (nonatomic) BOOL allowsPictureInPicturePlayback NS_AVAILABLE_IOS(9_0);@property (nonatomic) BOOL updatesNowPlayingInfoCenter NS_AVAILABLE_IOS(10_0);@property (nonatomic, weak, nullable) id <AVPlayerViewControllerDelegate> delegate NS_AVAILABLE_IOS(9_0);

四、视频状态监测

1、AVPlayer 与 AVPlayerItem都有status属性，可以用KVO监测；

//loadedTimeRange属性代表已经缓冲的进度，监听此属性可以在UI中更新缓冲进度，也是很有用的一个属性。

//AVPlayerItemStatus是代表当前播放资源item 的状态（可以理解成这url链接or视频文件。可以播放成功/失败）typedef NS_ENUM(NSInteger, AVPlayerItemStatus) { AVPlayerItemStatusUnknown, AVPlayerItemStatusReadyToPlay, AVPlayerItemStatusFailed};//AVPlayerStatus是代表当前播放器的状态。typedef NS_ENUM(NSInteger, AVPlayerStatus) { AVPlayerStatusUnknown, AVPlayerStatusReadyToPlay, AVPlayerStatusFailed};//编程的时候最好使用item 的status，会准确点。

2、视频跳跃播放
视频跳跃播放采用AVPlayer 对象的seekToTime:方法；

//跳到指定时间点播放//(_palyer 为AVPlayer 对象),10是秒数，1是单位秒[_player seekToTime:CMTimeMake(10,1)];//播放完成回到开始位置[_player seekToTime:kCMTimeZero];

3、AVPayerIterm的属性的监听

#pragma mark - KVO- (void)addItemKVO{    //KVO    [_item addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];    [_item addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];    [_item addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil];}- (void)removeItemKVO {    [_item removeObserver:self forKeyPath:@"status"];    [_item removeObserver:self forKeyPath:@"loadedTimeRanges"];    [_item removeObserver:self forKeyPath:@"playbackBufferEmpty"];}#pragma mark - Notic- (void)addVideoNotic {    //Notification    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieToEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieJumped:) name:AVPlayerItemTimeJumpedNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieStalle:) name:AVPlayerItemPlaybackStalledNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(backGroundPauseMoive) name:UIApplicationDidEnterBackgroundNotification object:nil];}- (void)removeVideoNotic {    //移除监听    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:nil];    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemPlaybackStalledNotification object:nil];    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemTimeJumpedNotification object:nil];    [[NSNotificationCenter defaultCenter] removeObserver:self];}