Error while using AVAudioSession in ios

Question

I used these codes

- (void)viewDidLoad
{
[[AVAudioSession sharedInstance] setDelegate: self];
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil];
AudioSessionAddPropertyListener (
                                 kAudioSessionProperty_AudioRouteChange,
                                 audioRouteChangeListenerCallback,
                                 self
                                 );
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
}

and

void audioRouteChangeListenerCallback (void *inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void *inPropertyValue ) {
    // ensure that this callback was invoked for a route change
    if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;


    {
        // Determines the reason for the route change, to ensure that it is not
        //      because of a category change.
        CFDictionaryRef routeChangeDictionary = (CFDictionaryRef)inPropertyValue;

        CFNumberRef routeChangeReasonRef = (CFNumberRef)CFDictionaryGetValue (routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason) );
        SInt32 routeChangeReason;
        CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);

        if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {

            //Handle Headset Unplugged
        } else if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) {
            //Handle Headset plugged in
        }

    }
}

to detect if audio jack is plugged in or out in my project but I end up with this error

Undefined symbols for architecture armv7:
  "_AVAudioSessionCategoryAmbient", referenced from:
      -[ViewController viewDidLoad] in ViewController.o
  "_OBJC_CLASS_$_AVAudioSession", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

So what is the issue in it? I'm a beginner in ios any help will be appreciated.

Answer 1

You have miss to add AudioToolBox.Frameworks to project file. Double check with your project file setting..

Update Actually missed AVFoundation.Frameworks to add in the build phase of project.

Update 2
The trailing s has been removed. Now it is AudioToolBox.Framework and AVFoundation.Framework