iOS开发-自定义相机实例(仿微信)

我在写这个demo时，是按照微信的样式写的，同样是点击拍照、长按录制视频，视频录制完直接进行播放，这里封装了一个简易的播放器：

m文件

#import "HAVPlayer.h"
#import <AVFoundation/AVFoundation.h>

@interface HAVPlayer ()

@property (nonatomic,strong) AVPlayer *player;//播放器对象

@end

@implementation HAVPlayer

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
  // Drawing code
}
*/

- (instancetype)initWithFrame:(CGRect)frame withShowInView:(UIView *)bgView url:(NSURL *)url {
  if (self = [self initWithFrame:frame]) {
    //创建播放器层
    AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
    playerLayer.frame = self.bounds;

    [self.layer addSublayer:playerLayer];
    if (url) {
      self.videoUrl = url;
    }

    [bgView addSubview:self];
  }
  return self;
}

- (void)dealloc {
  [self removeAvPlayerNtf];
  [self stopPlayer];
  self.player = nil;
}

- (AVPlayer *)player {
  if (!_player) {
    _player = [AVPlayer playerWithPlayerItem:[self getAVPlayerItem]];
    [self addAVPlayerNtf:_player.currentItem];

  }

  return _player;
}

- (AVPlayerItem *)getAVPlayerItem {
  AVPlayerItem *playerItem=[AVPlayerItem playerItemWithURL:self.videoUrl];
  return playerItem;
}

- (void)setVideoUrl:(NSURL *)videoUrl {
  _videoUrl = videoUrl;
  [self removeAvPlayerNtf];
  [self nextPlayer];
}

- (void)nextPlayer {
  [self.player seekToTime:CMTimeMakeWithSeconds(0, _player.currentItem.duration.timescale)];
  [self.player replaceCurrentItemWithPlayerItem:[self getAVPlayerItem]];
  [self addAVPlayerNtf:self.player.currentItem];
  if (self.player.rate == 0) {
    [self.player play];
  }
}

- (void) addAVPlayerNtf:(AVPlayerItem *)playerItem {
  //监控状态属性
  [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
  //监控网络加载情况属性
  [playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];

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

- (void)removeAvPlayerNtf {
  AVPlayerItem *playerItem = self.player.currentItem;
  [playerItem removeObserver:self forKeyPath:@"status"];
  [playerItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
  [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)stopPlayer {
  if (self.player.rate == 1) {
    [self.player pause];//如果在播放状态就停止
  }
}

/**
 * 通过KVO监控播放器状态
 *
 * @param keyPath 监控属性
 * @param object 监视器
 * @param change 状态改变
 * @param context 上下文
 */
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
  AVPlayerItem *playerItem = object;
  if ([keyPath isEqualToString:@"status"]) {
    AVPlayerStatus status= [[change objectForKey:@"new"] intValue];
    if(status==AVPlayerStatusReadyToPlay){
      NSLog(@"正在播放...，视频总长度:%.2f",CMTimeGetSeconds(playerItem.duration));
    }
  }else if([keyPath isEqualToString:@"loadedTimeRanges"]){
    NSArray *array=playerItem.loadedTimeRanges;
    CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次缓冲时间范围
    float startSeconds = CMTimeGetSeconds(timeRange.start);
    float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度
    NSLog(@"共缓冲：%.2f",totalBuffer);
  }
}

- (void)playbackFinished:(NSNotification *)ntf {
  Plog(@"视频播放完成");
  [self.player seekToTime:CMTimeMake(0, 1)];
  [self.player play];
}

@end

								 
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