运行后就崩溃，应该是约束的问题

[xiaoyuan]

第一次运行时出现的错误信息:reason: 'attempting to add unsupported attribute: (null)'
将HcdLightView单例的代码中的约束注释后，拖动滑块出现的错误信息
reason: 'AVPlayerItem cannot service a seek request with a completion handler until its status is AVPlayerItemStatusReadyToPlay.'

详细信息:关于第一次报错问题，我定位到错误是在创建HcdLightView单例的代码中，我把下面代码#warning -----注释了就可以运行起来了，但是拖动播放进步滑块时，还是会奔溃，我用的是Xcode8，请问怎么解决呀

• (instancetype)sharedInstance {
  static HcdLightView *instance;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
  instance = [[HcdLightView alloc] init];
  [[UIApplication sharedApplication].keyWindow addSubview:instance];
  #warning -----
  [instance mas_makeConstraints:^(MASConstraintMaker *make) {
  make.centerX.equalTo([UIApplication sharedApplication].keyWindow);
  make.centerY.equalTo([UIApplication sharedApplication].keyWindow).offset(-5);
  make.width.mas_equalTo(155);
  make.height.mas_equalTo(155);
  }];
  });
  return instance;
  }

第二个错误注释了seekToTime:CMTimeMakeWithSeconds方法就不报错了

• (void)seekToTime:(CGFloat)seconds {
  if (self.state == HCDPlayerStateStopped) {
  return;
  }

  seconds = MAX(0, seconds);
  seconds = MIN(seconds, self.duration);

  [self.player pause];
  #warning -----
  // [self.player seekToTime:CMTimeMakeWithSeconds(seconds, NSEC_PER_SEC) completionHandler:^(BOOL finished) {
  // self.isPauseByUser = NO;
  // [self.player play];
  // if (!self.currentPlayerItem.isPlaybackLikelyToKeepUp) {
  // self.state = HCDPlayerStateBuffering;
  //
  // self.actIndicator.hidden = NO;
  // [self.actIndicator startAnimating];
  // // [[XCHudHelper sharedInstance] showHudOnView:_showView caption:nil image:nil acitivity:YES autoHideTime:0];
  // }
  //
  // }];
  }