Question

i want to select songs from ipod Library and play it using avplayer i want the music to continue playing even after the app goes to background i am new to iOS programming can anyone help me out ..

Thanks

Answer 1

To allow the user to pick a song (or songs) from their music library, use the MPMediaPickerController class.

-(void) pickSong {

    // Create picker view
    MPMediaPickerController* picker = [[MPMediaPickerController alloc] init];
    picker.delegate = self;

    // Check how to display
    if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {

        // Show in popover
        [popover dismissPopoverAnimated:YES];
        popover = [[UIPopoverController alloc] initWithContentViewController:picker];
        [popover presentPopoverFromBarButtonItem:self.navigationItem.rightBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    } else {

        // Present modally
        [self presentViewController:picker animated:YES completion:nil];

    }

}

Change self.navigationItem.rightBarButtonItem if you’re not showing it from a button on the right side of title bar.

Then you need to listen for the result by implementing the delegate:

Called when the user cancelled the selection:

-(void) mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {

    // Dismiss selection view
    [self dismissViewControllerAnimated:YES completion:nil];
    [popover dismissPopoverAnimated:YES];
    popover = nil;

}

Called when the user chose something:

-(void) mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {

    // Dismiss selection view
    [self dismissViewControllerAnimated:YES completion:nil];
    [popover dismissPopoverAnimated:YES];
    popover = nil;

    // Get AVAsset
    NSURL* assetUrl = [mediaItemCollection.representativeItem valueForProperty:MPMediaItemPropertyAssetURL];
    AVURLAsset* asset = [AVURLAsset URLAssetWithURL:assetUrl options:nil];

    // Create player item
    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:asset];

    // Play it
    AVPlayer* myPlayer = [AVPlayer playerWithPlayerItem:playerItem];
    [myPlayer play]; 

}

You’ll need a UIPopoverController* popover; in your class .h file. Also you should retain myPlayer somewhere…

To allow music to continue in the background, add an audio string to the array in your Info.plist under the UIBackgroundModes key.