iOS之AVPlayer的简单应用

1.引入系统框架

2.创建视频的url

3.创建播放项目

4.初始化播放器

5.设置播放页面

//引入系统文件
#import
#import
@interface  ViewController ()
/**
 *  控制视频播放的控件
 */
@property  (weak,  nonatomic )  IBOutlet  UISlider *progressSlider;
/**
 *  声明播放视频的控件属性[既可以播放视频也可以播放音频]
 */
@property  ( nonatomic ,strong)AVPlayer *player;
/**
 *  播放的总时长
 */
@property  ( nonatomic ,assign)CGFloat sumPlayOperation;


@end

@implementation  ViewController

- ( void )viewDidLoad {
    [ super  viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //设置播放的url
    NSString  *playString = @ "http://static.tripbe.com/videofiles/20121214/9533522808.f4v.mp4" ;
    NSURL  *url = [ NSURL  URLWithString:playString];
    //设置播放的项目
    AVPlayerItem *item = [[AVPlayerItem alloc] initWithURL:url];
    //初始化player对象
    self .player = [[AVPlayer alloc] initWithPlayerItem:item];
    //设置播放页面
    AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:_player];
    //设置播放页面的大小
    layer.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 300);
    layer.backgroundColor = [UIColor cyanColor].CGColor;
    //设置播放窗口和当前视图之间的比例显示内容
    layer.videoGravity = AVLayerVideoGravityResizeAspect;
    //添加播放视图到self.view
    [ self .view.layer addSublayer:layer];
    //设置播放进度的默认值
    self .progressSlider.value = 0;
    //设置播放的默认音量值
    self .player.volume = 1.0f;

}
#pragma mark - 开始按钮响应方法
- ( IBAction )startPlayer:( id )sender {
    [ self .player play];
}
#pragma mark - 暂停按钮响应方法
- ( IBAction )stopPlayer:( id )sender {
    [ self .player pause];
}
#pragma mark - 改变进度
- ( IBAction )changeProgress:( id )sender {
    self .sumPlayOperation =  self .player.currentItem.duration.value/ self .player.currentItem.duration.timescale;
    //CMTimeMake(a,b) a表示当前时间，b表示每秒钟有多少帧
    [ self .player seekToTime:CMTimeMakeWithSeconds( self .progressSlider.value* self .sumPlayOperation,  self .player.currentItem.duration.timescale) completionHandler:^( BOOL  finished) {
        [ self .player play];
    }];

}