iOS开发（OC）——音视频播放

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Demo地址：https://github.com/liumude/MediaPlay.git
（自己封装的，写得不好还请指出）

1. 新建一个继承NSObject的类PlayModel
2. 导入音视频播放需要的头文件

#import <Foundation/Foundation.h>
#import <MediaPlayer/MediaPlayer.h>
#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>

3.创建播放单例

+(PlayModel *)shareInstance{
    static PlayModel *player = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        player = [[PlayModel alloc] init];
    });
    return player;
}

4.音频播放初始化

//音频
-(void)initAudioPlayerWithUrl:(NSURL *)url{
    playerItem = [AVPlayerItem playerItemWithURL:url];
    audioPlayer =[AVPlayer playerWithPlayerItem:playerItem];
    [self start];
    currentTime = 0;

//    //支持后台播放 还要在background modes 勾选Audio,AirPlay
//    AVAudioSession *session = [AVAudioSession sharedInstance];
//    [session setActive:YES error:nil];
//    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
}

5.视频播放初始化

//视频
-(void)initMoviePlayerWithUrl:(NSURL *)url addToView:(UIView *)view{
    playerItem = [AVPlayerItem playerItemWithURL:url];
    audioPlayer =[[AVPlayer alloc] initWithPlayerItem:playerItem];

    playerLayer = [AVPlayerLayer playerLayerWithPlayer:audioPlayer];
    playerLayer.frame = CGRectMake(0, 0, view.frame.size.width, view.frame.size.height);
    [view.layer addSublayer:playerLayer];
    playerLayer.videoGravity =AVLayerVideoGravityResizeAspect;

    currentTime = 0;
}

6.开始播放的方法

-(void)start{
    [audioPlayer play];
    if(_timer != nil){
        [_timer invalidate];
        _timer = nil;
    }
    //获取播放进度
    _timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(progressAction) userInfo:nil repeats:YES];

    //播放开始的通知
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"PlayStart" object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playStart:) name:@"PlayStart" object:nil];

    //播放结束的通知
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"PlayEnd" object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playEnd:) name:@"PlayEnd" object:nil];
}

7.获取当前时间和总时间

-(CGFloat)currentTime{
    return CMTimeGetSeconds(playerItem.currentTime);
}

-(CGFloat)duration{
    return CMTimeGetSeconds(playerItem.duration);
}

8.播放进度

-(void)progressAction{
    if(currentTime < [self currentTime]){//当前时间比播放前的时间大，播放开始
        [[NSNotificationCenter defaultCenter] postNotificationName:@"PlayStart" object:nil userInfo:nil];
    }
    if([self currentTime] >= [self duration]){//播放结束
        [[NSNotificationCenter defaultCenter] postNotificationName:@"PlayEnd" object:nil userInfo:nil];
    }

    if(_isplaying){
        if(_playDelegate != nil){
            [_playDelegate playingProgress:[self currentTime]/[self duration]];
        }
    }
}

9.从特定时间开始播放

//从特定时间开始播放
-(void)playWithTime:(CGFloat)time{
    [self pause];
    CMTime pointTime = CMTimeMake(time * [self duration], 1);
    currentTime = time * [self duration];//获取播放前的当前时间
    [playerItem seekToTime:pointTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
    [self start];
}

以上是主要代码，详细请看Demo：https://github.com/liumude/MediaPlay.git

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