iOS检测耳机插入/拔出

#import <AVFoundation/AVFoundation.h>    - (BOOL)isHeadsetPluggedIn {      AVAudioSessionRouteDescription* route = [[AVAudioSession sharedInstance] currentRoute];      for (AVAudioSessionPortDescription* desc in [route outputs]) {          if ([[desc portType] isEqualToString:AVAudioSessionPortHeadphones])              return YES;      }      return NO;  } 

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