AVAudioPlayer does not play when app goes to background

Question

I am trying out the AVFoundationFramework.

Presently I am able to run the AVAudioPlayer in the foreground. When the app goes to the background, the AVAudioPlayer does not continue to play.

The exact steps of implementation are:

1. Adding Background Tasks to the .plist

   

2. Setting up AVAudioPlayer

   self.objAVAudioPlayer = [[AVAudioPlayer alloc]initWithData:mp3Data error:&error];
   self.objAVAudioPlayer.delegate = self;
   

3. Setting up AVAudioSession

   if([self.objAVAudioPlayer prepareToPlay])
   {
       AVAudioSession *objAVAudioSession = [AVAudioSession sharedInstance];
       [objAVAudioSession setCategory:AVAudioSessionCategoryPlayback error:&error];
       [objAVAudioSession setActive:YES
                                        error:nil];
       [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
       [self.objAVAudioPlayer play];
   }
   

When the app is resumed, it starts from the exact same place where it resigned.

The base SDK is iOS 7.0.

Any idea as to what I am missing? Any help will be appreciated.

Answer 1

For playing audio in background mode you should set up AVAudioSession and add this code

UIBackgroundTaskIdentifier backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{
    [application endBackgroundTask:backgroundTask]; //Tell the system that we are done with the tasks
    backgroundTask = UIBackgroundTaskInvalid; //Set the task to be invalid
 }];

into your AppDelegate.m class in method

- (void)applicationDidEnterBackground:(UIApplication *)application {
    //Some code
}