MPMoviePlayerViewController exits after background - objective-c

Question

When my app goes to background and back, modal view closes. Why is this happend? I tried with pause on and off. I have ARC enabled, if it is a useful info.
MPMoviePlayerViewController * player = [[MPMoviePlayerViewController alloc] initWithContentURL:targetURL];
[player.moviePlayer prepareToPlay];
[self presentMoviePlayerViewControllerAnimated:player];

Answer 1

In case anyone else stumbles across this (as I did before I found my own solution), I was able to prevent MPMoviePlayerViewController from exiting when the app backgrounds by subclassing it and removing it as an observer of UIApplicationDidEnterBackgroundNotification:
- (id)initWithContentURL:(NSURL *)contentURL {
self = [super initWithContentURL:contentURL];
if (self){
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
}
return self;
}

Answer 2

You don't need to subclass MPMoviePlayerViewController - just do following after creating MPMoviePlayerViewController instance.
[[NSNotificationCenter defaultCenter] removeObserver:self.moviePlayerViewController name:UIApplicationDidEnterBackgroundNotification object:nil];

Answer 3

Here is full code that can help you
// Call this to start initialization and play movie
-(void)prepareMoviePlayer:(NSURL *)moviePath
{
moviePlayerViewController = [[MPMoviePlayerViewController alloc] initWithContentURL:moviePath];
if ([[moviePlayerViewController moviePlayer] respondsToSelector:#selector(loadState)])
{
[[moviePlayerViewController moviePlayer] setControlStyle:MPMovieControlStyleNone];
[[moviePlayerViewController moviePlayer] setFullscreen:YES];
[[moviePlayerViewController moviePlayer] prepareToPlay];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(moviePlayerLoadStateDidChange:)
name:MPMoviePlayerLoadStateDidChangeNotification
object:nil];
}
}
- (void) addPlayer
{
[[[moviePlayerViewController moviePlayer] view] setFrame:self.view.bounds];
[[self view] addSubview:[[moviePlayerViewController moviePlayer] view]];
}
static NSTimeInterval t;
// Call this on applicationWillResignActive
-(void) pauseMovieInBackGround
{
[[moviePlayerViewController moviePlayer] pause];
t = [[moviePlayerViewController moviePlayer] currentPlaybackTime];
[moviePlayerViewController.view removeFromSuperview];
}
// Call this on applicationWillEnterForeground
-(void) resumeMovieInFrontGround
{
[self addPlayer];
[[moviePlayerViewController moviePlayer] stop];
[[moviePlayerViewController moviePlayer] setInitialPlaybackTime:t];
[[moviePlayerViewController moviePlayer] play];
}
-(void)moviePlayerLoadStateDidChange:(NSNotification *)notification
{
if([[moviePlayerViewController moviePlayer] loadState] != MPMovieLoadStateUnknown)
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerLoadStateDidChangeNotification
object:nil];
[self addPlayer];
[[moviePlayerViewController moviePlayer] play];
}
}
-(void)videoPlayBackDidFinish:(NSNotification*)notification
{
[self dismissMoviePlayerViewControllerAnimated];
}

Answer 4

I am coming across this issue.
I've tried ChrisH's answer, but it didn't work for me until I put removeObserver into viewDidLoad() instead of init().
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
}
Then it works. Enjoy it.