Observing currentPlaybackTime and showing an overlay at intervals - ios

Question

I’m making a video that shows overlays at certain intervals of a video. I’ve managed to get the video to play. Now my objective is to watch/observe the currentPlaybackTime value and pause the video when it hits 2 seconds.
After some research found that currentPlaybackTime does not support KOV. So I need to implement this solution but I have no idea where to put the code - I’m very new to Objective C. I keep trying to put it in the ViewController (My only view) but the way its written hints to it being placed somewhere else…
Should I create a new controller for it? Or do I override methods from the MediaPlayer framework?
Here's my code:
#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
#interface ViewController : UIViewController
#property (strong, nonatomic) MPMoviePlayerController *movieController;
#property(nonatomic) NSTimeInterval currentPlaybackTime;
#end
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidAppear:(BOOL)animated {
self.movieController = [[MPMoviePlayerController alloc] init];
NSString *moviePath = [[NSBundle mainBundle] pathForResource:#"Movie" ofType:#"m4v"];
NSURL *movieURL = [NSURL fileURLWithPath:moviePath];
self.movieController = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
[self.movieController.view setFrame:CGRectMake (0, 0, 480, 326)];
[self.view addSubview:self.movieController.view];
[self.movieController play];
[self.movieController currentPlaybackTime];
}
#end

Answer 1

You can implement following method in your found solution in this same view controller.
Right after
[self.movieController play];
call following method
[self BeginPlayerPolling];
Register this class as an observer before in your viewDidAppear where you initialised your movieController
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(movieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object: self.movieController];
self.movieController = [[MPMoviePlayerController alloc] init];
and implement this notification observer's method
- (void)movieFinishedCallback:(NSNotification*)aNotification
{
// Remove the movie player view controller from the "playback did finish" notification observers
[[NSNotificationCenter defaultCenter] removeObserver: self
name:MPMoviePlayerPlaybackDidFinishNotification
object: self.movieController];
[self EndPlayerPolling];
}