iOS--检测耳机的拔插

注册一个通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChangeListenerCallback:)   name:AVAudioSessionRouteChangeNotification object:[
                                                                                                                                                                      AVAudioSession sharedInstance]];```

相应耳机发生变化的事件

/**

• 耳机通知
• @param notification 通知
  */

• (void)audioRouteChangeListenerCallback:(NSNotification*)notification{
  NSDictionary *interuptionDict = notification.userInfo;
  NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
  switch (routeChangeReason) {
  case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
  // NSLog(@"AVAudioSessionRouteChangeReasonNewDeviceAvailable");
  //插入耳机
  break;
  case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
  // NSLog(@"AVAudioSessionRouteChangeReasonOldDeviceUnavailable");
  //拔出耳机
  break;
  case AVAudioSessionRouteChangeReasonCategoryChange:
  // called at start - also when other audio wants to play
  NSLog(@"AVAudioSessionRouteChangeReasonCategoryChange");
  break;
  }
  }

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