Film Countdown Core Animation Layer

I wanted some sort of countdown mechanism for a project I was working on, so I created this Core Animation layer. It is implemented entirely in layers. There is no imagery used at all. Here is a screenshot of what it produces:

Here is how you use the code. To add it to a view controller,

- (void)viewDidLoad
{
  [super viewDidLoad];

  _filmCountdownLayer = [MLFilmCountdownLayer layer];
  [_filmCountdownLayer setPosition:[[self view] center]];
  
  [[[self view] layer] addSublayer:_filmCountdownLayer];

}

Then, create some action and trigger the animation and provide it a completion block.

- (IBAction)didTapRunAnimationButton:(id)sender
{
  [_filmCountdownLayer setOpacity:1.0f];
  [_filmCountdownLayer setCount:5];
  [_filmCountdownLayer startCountdownWithCompletionBlock:^{
    [CATransaction begin];
    [CATransaction setAnimationDuration:2.0f];
    [_filmCountdownLayer setOpacity:0.0f];
    [CATransaction commit];
  }];
}

This code fades the whole countdown layer to a zero opacity when the animation has completed.

Known Issues

I haven't had time to work out scaling the text size based on the frame size much yet, so feel free to let me now if you play with that and get it sorted. I'll merge your changes. Otherwise, you'll just have to tweak that in the internals until I get a chance to fix it.

License

The code is MIT licensed. Have fun with it. Submit pull requests if you add some cool or interesting additions. Keep in mind, though, that I might ignore you.

Thanks and have fun.