CODEWITHSUNDEEP
objective-ciosbackgroundavfoundationavaudioplayer
Nikita Pestrov
Nikita Pestrov

Reputation: 5966

Playing a sequence of audio files in background

In my app i have an instance of AVAudioPlayer, that plays a sequence of mp3's ,switching to the next one by initWithData:

I want to let the user continue listening to the player even if he switchs off the screen or goes to the background. I know, that i can use remotecontrolevents to switch to the other audio when the user taps it, but can i make it switch automaticly,just like in iPod player?

Upvotes: 0

Views: 1692

Answers (1)

sooper
sooper

Reputation: 6039

You need to use the AVAudioPlayerDelegate protocols. First include it in your interface:

@interface MyAppViewController : UIViewController <AVAudioPlayerDelegate> {
    AVAudioPlayer   *yourPlayer;
}

@property (nonatomic, retain) AVAudioPlayer *yourPlayer;

Then in your implementation:

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
//This method is called once the file has finished playing
//Insert code here to play the next file
}

Don't forget to set the delegate of yourPlayer to self in your viewDidLoad method (or where ever you decide to put it):

- (void)viewDidLoad {
    [super viewDidLoad]

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive: YES error: nil];

    if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginReceivingRemoteControlEvents)]){
        [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
        [self becomeFirstResponder];
    }

    self.yourPlayer = [[AVAudioPlayer alloc] init];
    self.yourPlayer.delegate = self;
}

You'll also need to change Required Background Modes in your info.plist to App plays audio

Don't forget to unregister the remote control events (viewDidUnload):

[[UIApplication sharedApplication] endReceivingRemoteControlEvents]

Upvotes: 4

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