iOS之AVPlayer的簡單應用

1.引入系統框架

2.創建視頻的url

3.創建播放項目

4.初始化播放器

5.設置播放頁面

//引入系統文件
#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>
@interface ViewController ()
/**
 *  控制視頻播放的控件
 */
@property (weak, nonatomic) IBOutlet UISlider *progressSlider;
/**
 *  聲明播放視頻的控件屬性[既可以播放視頻也可以播放音頻]
 */
@property (nonatomic,strong)AVPlayer *player;
/**
 *  播放的總時長
 */
@property (nonatomic,assign)CGFloat sumPlayOperation;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //設置播放的url
    NSString *playString = @"http://static.tripbe.com/videofiles/20121214/9533522808.f4v.mp4";
    NSURL *url = [NSURL URLWithString:playString];
    //設置播放的項目
    AVPlayerItem *item = [[AVPlayerItem alloc] initWithURL:url];
    //初始化player對象
    self.player = [[AVPlayer alloc] initWithPlayerItem:item];
    //設置播放頁面
    AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:_player];
    //設置播放頁面的大小
    layer.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 300);
    layer.backgroundColor = [UIColor cyanColor].CGColor;
    //設置播放窗口和當前視圖之間的比例顯示內容
    layer.videoGravity = AVLayerVideoGravityResizeAspect;
    //添加播放視圖到self.view
    [self.view.layer addSublayer:layer];
    //設置播放進度的默認值
    self.progressSlider.value = 0;
    //設置播放的默認音量值
    self.player.volume = 1.0f;
    
}
#pragma mark - 開始按鈕響應方法
- (IBAction)startPlayer:(id)sender {
    [self.player play];
}
#pragma mark - 暫停按鈕響應方法
- (IBAction)stopPlayer:(id)sender {
    [self.player pause];
}
#pragma mark - 改變進度
- (IBAction)changeProgress:(id)sender {
    self.sumPlayOperation = self.player.currentItem.duration.value/self.player.currentItem.duration.timescale;
    //CMTimeMake(a,b) a表示當前時間，b表示每秒鍾有多少幀
    [self.player seekToTime:CMTimeMakeWithSeconds(self.progressSlider.value*self.sumPlayOperation, self.player.currentItem.duration.timescale) completionHandler:^(BOOL finished) {
        [self.player play];
    }];
    
}