How to add KVO to MPMoviePlayer currentPlaybackTime?

Question

How to add KVO to currentPlaybackTime property of MPMoviePlayer class?

Answer 1

You cannot add KVO to currentPlaybackTime since the property is not explicitly declared as KVO compatible.

Instead, you can regularly test the player and save the position with the code, for example:

- (void) BeginPlayerPolling { self.pollPlayerTimer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(PollPlayerTimer_tick:) userInfo:nil repeats:YES]; } - (void) PollPlayerTimer_tick:(NSObject *)sender { // Store current playback position if (player.playbackState == MPMoviePlaybackStatePlaying) lastRecordedPlaybackTime = player.currentPlaybackTime; } - (void) EndPlayerPolling { if (pollPlayerTimer != nil) { [pollPlayerTimer invalidate]; self.pollPlayerTimer = nil; } }