Are headphones plugged in? iOS7

 If you need to detect whether the user has pulled out or plugged in the headphone.

#import <AVFoundation/AVFoundation.h>

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

// If the user pulls out he headphone jack, stop playing. - (void)audioRouteChangeListenerCallback:(NSNotification*)notification { NSDictionary *interuptionDict = notification.userInfo; NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue]; switch (routeChangeReason) { case AVAudioSessionRouteChangeReasonNewDeviceAvailable: NSLog(@"AVAudioSessionRouteChangeReasonNewDeviceAvailable"); NSLog(@"Headphone/Line plugged in"); break; case AVAudioSessionRouteChangeReasonOldDeviceUnavailable: NSLog(@"AVAudioSessionRouteChangeReasonOldDeviceUnavailable"); NSLog(@"Headphone/Line was pulled. Stopping player...."); break; case AVAudioSessionRouteChangeReasonCategoryChange: // called at start - also when other audio wants to play NSLog(@"AVAudioSessionRouteChangeReasonCategoryChange"); break; } }

转载：http://stackoverflow.com/questions/21292586/are-headphones-plugged-in-ios7