iOS 监听耳机状态

// iOS 7 的代码
- (BOOL)hasHeadset
{
#if TARGET_IPHONE_SIMULATORreturn NO;
#elseCFStringRef route;UInt32 size = sizeof(CFStringRef);AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);if((route == NULL) || (CFStringGetLength(route) == 0)){NSLog(@"AudioSessionGetProperty failed!");}else{NSString* routeStr = (__bridge NSString*)route;NSLog(@"AudioRoute: %@", routeStr);/* Known values of route:* "Headset"* "Headphone"* "Speaker"* "SpeakerAndMicrophone"* "HeadphonesAndMicrophone"* "HeadsetInOut"* "ReceiverAndMicrophone"* "Lineout"*/NSRange headphoneRange = [routeStr rangeOfString : @"Headphone"];NSRange headsetRange = [routeStr rangeOfString : @"Headset"];if (headphoneRange.location != NSNotFound|| headsetRange.location != NSNotFound){return YES;}}return NO;
#endif
}// iOS 6 之后的代码
- (void)addHeadPhoneListener
{NSNotificationCenter *center = [NSNotificationCenter defaultCenter];[center addObserver:selfselector:@selector(audioRouteChangeListenerCallback:)name:AVAudioSessionRouteChangeNotificationobject:nil];
}// If the user pulls out he headphone jack, stop playing.
- (void)audioRouteChangeListenerCallback:(NSNotification*)notification
{AVAudioSession *audioSession = [AVAudioSession sharedInstance];AVAudioSessionRouteDescription *curRoute = audioSession.currentRoute;NSDictionary *interuptionDict = notification.userInfo;NSLog(@"interuptionDict:%@", interuptionDict);AVAudioSessionPortDescription * portDescription = [curRoute.outputs firstObject];AVAudioSessionPortDescription * inputDesc = [curRoute.inputs firstObject];//例如输出：Headphones,耳机NSLog(@"%@,%@", portDescription.portType, portDescription.portName);//例如输出：MicrophoneWired, 耳机麦克风NSLog(@"%@, %@", inputDesc.portType, inputDesc.portName);NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
//    AVAudioSessionRouteDescription *val = interuptionDict[AVAudioSessionRouteChangePreviousRouteKey];switch (routeChangeReason){case AVAudioSessionRouteChangeReasonNewDeviceAvailable:NSLog(@"Headphone/Line plugged in");break;case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:NSLog(@"Headphone/Line was pulled. Stopping player....");break;case AVAudioSessionRouteChangeReasonCategoryChange:break;}
}

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