Changing MPMoviePlayerController content not working with performSelectorInBackground - ios

Question

I am trying to change the content of my MPMoviePlayerController method with function running in background.But my content is not getting changed.
[self performSelectorInBackground:#selector(updateVideo) withObject:nil];
This is my viewDidLoad method where I start loading a video.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
VideoView *videoView = [[VideoView alloc] initWithFrame:CGRectMake(0, 0, 293, 320)];
NSString *videoPath = [[NSBundle mainBundle] pathForResource:#"My Movie4" ofType:#"mp4"];
NSURL *videoURL = [NSURL fileURLWithPath:videoPath];
controller = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
[controller.view setFrame:videoView.bounds];
[videoView addSubview:controller.view];
[self.videoviewer addSubview: videoView];
[controller prepareToPlay];
[controller play];
}
Where VideoView is a subclass of UIView.My updateVideo function is like this.
-(void)updateVideo
{
[controller setContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"video2" ofType:#"mp4"] ]];
[controller prepareToPlay];
[controller play];
}
But the video content is not getting changed when the function is called which is running in background.

Answer 1

Why are you trying to change the content in the background thread ?
You can't change UI element in the background thread. You have to execute this task in the main thread.
Try to do this :
[self updateVideo]
Or this if you want, but I recommend you to use the first method.
-(void)updateVideo
{
[controller setContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"video2" ofType:#"mp4"] ]];
dispatch_async(dispatch_get_main_queue(), ^{
[controller prepareToPlay];
[controller play];
});
}
I hope this can help you