iOS检测耳机插入拔出

首先，需要导入两个框架

然后，注册通知检测耳机的插入与拔出操作

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

通知方法

- (void)outputDeviceChanged:(NSNotification *)aNotification {
    AVAudioSessionRouteDescription* route = [[AVAudioSession sharedInstance] currentRoute];
    for (AVAudioSessionPortDescription* desc in [route outputs]) {

    if ([[desc portType] isEqualToString:AVAudioSessionPortHeadphones])
            NSLog(@"有耳机");
    else{
        NSLog(@"没有耳机");
    }

    }

}