使用AVPlayer实现自定义视频播放器

引入头文件

#import<AVFoundation/AVFoundation.h>

定义三个属性

@property (nonatomic,strong) AVPlayer *player;
@property (nonatomic,strong) AVPlayerLayer *playerLayer;
@property (nonatomic,strong) AVPlayerItem *playerItem;

初始化播放器

    // 1、创建AVPlayerItem
    _playerItem = [AVPlayerItem playerItemWithURL:sourceMovieURL];
    // 2、根据AVPlayerItem创建媒体播放器
    _player = [AVPlayer playerWithPlayerItem:_playerItem];
    // 3、创建AVPlayerLayer，用于呈现视频
    _playerLayer = [AVPlayerLayer playerLayerWithPlayer:_player];
    // 4、设置显示大小和位置
    _playerLayer.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));
    // 5、设置拉伸模式
    _playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
    // 6、获取播放持续时间
    NSLog(@"%lld", _playerItem.duration.value);
    [self.layer addSublayer:_playerLayer];
    // 播放1s回调一次
    [_player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:NULL usingBlock:^(CMTime time) {

    }];

播放和暂停的控制

- (void)clickPlayBtn {
        //当视频加载成功时
    if (_player && _player.currentItem.status == AVPlayerStatusReadyToPlay) {
                //rate为0表示是暂停状态
        if (_player.rate == 0) {
            [self.toolsView.PlayButton setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
            if (self.isEnd) {
                [self.player seekToTime:CMTimeMakeWithSeconds(0, NSEC_PER_SEC) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];//播放结束后，点击播放从头开始重新播放
            }
            [_player play];//开始播放
        }else {
            [_player pause];//暂停播放
            [self.toolsView.PlayButton setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
        }
    }
}

使用kvo监听播放器准备状态和缓冲状态

- (void)addKVOObserver {
    [_playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];// 监听status属性
    [_playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];// 监听loadedTimeRanges属性
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    AVPlayerItem *playerItem = (AVPlayerItem *)object;
    if ([keyPath isEqualToString:@"status"]) {
        if ([playerItem status] == AVPlayerStatusReadyToPlay) {
            NSLog(@"AVPlayerStatusReadyToPlay");
            self.toolsView.PlayButton.enabled = YES;
            CMTime duration = self.playerItem.duration;// 获取视频总长度
            self.totalSeconds = [self getTimeToSeconds:duration];
            self.toolsView.totalTimeLabel.text = [self secondsToString:self.totalSeconds];
        } else if ([playerItem status] == AVPlayerStatusFailed) {
            NSLog(@"AVPlayerStatusFailed");//视频源初始化失败
        }
    } else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
        NSTimeInterval timeInterval = [self availableDuration];// 计算缓冲进度
        NSLog(@"已缓冲:%f",timeInterval);
        CMTime duration = self.playerItem.duration;
        CGFloat totalDuration = CMTimeGetSeconds(duration);
        [self.toolsView.loadProgressView setProgress:timeInterval / totalDuration animated:YES];
    }
}

监听播放结束

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.player.currentItem];

- (void)playbackFinished:(NSNotification *)noti {
    NSLog(@"播放结束");
    [self.toolsView.PlayButton setImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
    self.toolsView.slider.value = 0;
    self.isEnd = YES;
    self.toolsView.currentTimeLabel.text = @"00:00";
}

下面是几个用到的工具方法

- (CGFloat)getTimeToSeconds:(CMTime)time {
    CGFloat second = time.value / time.timescale;// 转换成秒
    return second;
}

- (NSString *)secondsToString:(CGFloat)seconds {
    NSNumber *num = [NSNumber numberWithFloat:seconds];
    int sec = [num intValue] % 60;

    NSString *secStr = [NSString stringWithFormat:@"%d",sec];
    if (sec<10) {
        secStr = [NSString stringWithFormat:@"0%d",sec];
    }
    
    int min = [num intValue] / 60;
    NSString *minStr = [NSString stringWithFormat:@"%d",min];
    if (min<10) {
        minStr = [NSString stringWithFormat:@"0%d",min];
    }
    NSString *resultString = [NSString stringWithFormat:@" %@:%@ ",minStr,secStr];
    return resultString;
    
}

- (NSTimeInterval)availableDuration{
    NSArray *loadedTimeRanges = [[self.player currentItem] loadedTimeRanges];
    CMTimeRange timeRange = [loadedTimeRanges.firstObject CMTimeRangeValue];// 获取缓冲区域
    float startSeconds = CMTimeGetSeconds(timeRange.start);
    float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    NSTimeInterval result = startSeconds + durationSeconds;// 计算缓冲总进度
    return result;
}

调用方式

self.playerView = [[PlayerView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 200)];
[self.view addSubview:self.playerView];
self.playerView.sourcePath = path;//本地文件路径或者http网络路径都行

具体使用方式可以参考https://github.com/zjl0624/CZPlayer