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POAVAudioPlayer cannot play music with a NSTimer in background
 

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    <p>I want to play music with an AVAudioPlayer using an NSTimer, but <code>[player prepareToPlay]</code> returns NO &amp; doesn't play in the background.</p> <p>Can somebody give me some idea?</p> <p>Here's my code:</p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(playMusic:) userInfo:nil repeats:NO]; [self.window makeKeyAndVisible]; return YES; } - (void)playMusic:(NSTimer *)timer{ [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil]; NSString *fileName = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"Apologize.mp3"]; NSURL *fileUrl = [NSURL fileURLWithPath:fileName]; NSError *error; AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:&amp;error]; if ([player prepareToPlay]) { [player play]; NSLog(@"start!"); }else{ NSLog(@"error msg ：%@",error); } } - (void)applicationDidEnterBackground:(UIApplication *)application { if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginReceivingRemoteControlEvents)]){ [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; } UIBackgroundTaskIdentifier backgroundTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{ // /* just fail if this happens. */ [[UIApplication sharedApplication] endBackgroundTask:backgroundTask]; }]; } </code></pre>
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