how to start to play music in locked screen in iPhone

Question

I am using UILocalNotification to alert the user if app not running and MPMusicPlayerController to play iPod music and MPMoviePlayerController

Answer 1

use AVAudioSessionCategoryPlayback for audio session. Check audio session programming guide here

Answer 2

@manju sorry i got late but it work for you.

 selectedDate = [timePicker date];

it is selectedDate date object,at this time your notification will came.
[NSDate date] by this you can find current time. and find different both time via.

 NSTimeInterval timeDifference =  [ selectedDate timeIntervalSinceDate:[NSDate date]];   

Now when your are schedule your notification then .write this code

 UIApplication *app = [UIApplication sharedApplication];
 UIBackgroundTaskIdentifier bgTask = 0;

 NSTimer  *backgroundTimer = [NSTimer scheduledTimerWithTimeInterval:timeDifference    target:self  selector:@selector(backgroundTask) userInfo:nil repeats:NO];


    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
    [app endBackgroundTask:bgTask];
    }];

    -(void)backgroundTask
    {
        NSLog(@"Here you can play song via player ");
       }

Don't forgot to add in app.infolist

UIApplication BackgroundMode Audio it will solve your problem , play song when device is lock.