Transparent PNG Animation

This is the code I am using to draw animations of explosions onto some UIImageViews.

I struggled a lot with "Animated PNG with Transparent Region" in this code, but in the end discovered that iPhone animation do not support PNG-8 and you must use PNG-24.

 NSMutableArray *frames = [NSMutableArray arrayWithCapacity:25];

    

    for (int i = 0; i < 26; i++) {

        UIImage *frame = [UIImage imageNamed:[NSString stringWithFormat:@"exp%d.png", i]];

        

        [frames addObject:frame];

    }

    

    self.playerShipImageAnim = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"exp0.png"]];

    self.hostileShipImageAnim = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"exp0.png"]];

    

    [playerShipImage addSubview:playerShipImageAnim];

    [hostileShipImage addSubview:hostileShipImageAnim];

    

    playerShipImageAnim.animationImages = frames;

    hostileShipImageAnim.animationImages = frames;

    playerShipImageAnim.animationRepeatCount = 1;

    hostileShipImageAnim.animationRepeatCount = 1;

    playerShipImageAnim.animationDuration = 0.5;

    hostileShipImageAnim.animationDuration = 0.5;