Are headphones plugged in? iOS7

This should work, but I cannot test it right now, I'll do in the evening.

- (BOOL)isHeadsetPluggedIn {    AVAudioSessionRouteDescription* route = [[AVAudioSession sharedInstance] currentRoute];    for (AVAudioSessionPortDescription* desc in [route outputs]) {        if ([[desc portType] isEqualToString:AVAudioSessionPortHeadphones])            return YES;    }    return NO;}

Just to extend @Antonio's answer. If you need to detect whether the user has pulled out or plugged in the headphone.

#import <AVFoundation/AVFoundation.h>

// [AVAudioSession sharedInstance]; // @Boris edited: you may need it if there is no `AVAudioSession instance` created before. If doesn't work, uncomment this line.[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChangeListenerCallback:)                                             name:AVAudioSessionRouteChangeNotification                                           object:nil];// don't forget to `removeObserver:`

// 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;    }}

Swift 3:

To check if headphones are connected

extension AVAudioSession {    static var isHeadphonesConnected: Bool {        return sharedInstance().isHeadphonesConnected    }    var isHeadphonesConnected: Bool {        return !currentRoute.outputs.filter { $0.isHeadphones }.isEmpty    }}extension AVAudioSessionPortDescription {    var isHeadphones: Bool {        return portType == AVAudioSessionPortHeadphones    }}

Then you can just print("isHeadphones connected: \(AVAudioSession.isHeadphonesConnected)")

Listening to Changes

In Swift 3 the syntax is this:

func handleRouteChange(_ notification: Notification) {    guard    let userInfo = notification.userInfo,    let reasonRaw = userInfo[AVAudioSessionRouteChangeReasonKey] as? NSNumber,    let reason = AVAudioSessionRouteChangeReason(rawValue: reasonRaw.uintValue)    else { fatalError("Strange... could not get routeChange") }    switch reason {    case .oldDeviceUnavailable:        print("oldDeviceUnavailable")    case .newDeviceAvailable:        print("newDeviceAvailable")         if AVAudioSession.isHeadphonesConnected {             print("Just connected headphones")        }     case .routeConfigurationChange:        print("routeConfigurationChange")    case .categoryChange:        print("categoryChange")    default:        print("not handling reason")    }}func listenForNotifications() {    NotificationCenter.default.addObserver(self, selector: #selector(handleRouteChange(_:)), name: NSNotification.Name.AVAudioSessionRouteChange, object: nil)}

Notice use of:

 if AVAudioSession.isHeadphonesConnected {    print("Just connected headphones") }