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可能重复：
如何确定外部耳机是否连接到 iPhone？

我正在开发一个音频播放器应用程序，并且在其中一种模式（播放模式）下，我想检测耳机的状态，如果插入了插孔，它应该播放，否则不应该播放。

编辑下面是我的代码片段，也有关于我想要做什么的解释。我从 SO 上的其他线程中找到了大部分代码，但仍然无法让它按我想要的方式运行。

- (void)isHeadsetPluggedIn {

    UInt32 routeSize = sizeof (CFStringRef);
    CFStringRef route;

    AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
                             &routeSize,
                             &route);

    NSString* routeStr = (NSString*)route;

    NSRange headsetRange = [routeStr rangeOfString : @"Headset"];
    NSRange receiverRange = [routeStr rangeOfString : @"Receiver"];

    if(headsetRange.location != NSNotFound) {
        // Don't change the route if the headset is plugged in.
        NSLog(@"headphone is plugged in ");
          //here is the place i want to play music
          /* AVAudioPlayer *mySound;

    mySound =[[AVAudioPlayer alloc]initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"apple_SIMToolkitPositiveACK" withExtension:@"mp3" ]error:nil];
    [mySound play];

//here is the place where i must receive the info about plug-in(headset)
*/
    }
    else if (receiverRange.location != NSNotFound) {
        // Change to play on the speaker
        NSLog(@"play on the speaker");

    }
    else {
        NSLog(@"Unknown audio route.");

    }
}
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