animating the bouncing "LIKE" image

gistfile1.txt

- (void) likeFeed {
    
    UIImageView * animatedLikeImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"coverfeed-like_button"]];
    animatedLikeImageView.frame = CGRectMake(80.0f, 210.0f, 160.0f, 160.0f);
    animatedLikeImageView.contentMode = UIViewContentModeScaleToFill;
    self.animatedLikeImageView = animatedLikeImageView;
    self.animatedLikeImageView.hidden = YES;
    [self.view addSubview:self.animatedLikeImageView];
    
    double delayInSeconds = .3;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        self.animatedLikeImageView.hidden = NO;
        self.animatedLikeImageView.layer.anchorPoint = CGPointMake(0.50, .5);
        CAKeyframeAnimation *bounceAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
        bounceAnimation.values = [NSArray arrayWithObjects:
                                  [NSNumber numberWithFloat:0.8],
                                  [NSNumber numberWithFloat:1.5],
                                  [NSNumber numberWithFloat:0.0],
                                  nil];
        
        bounceAnimation.duration = 0.6;
        [bounceAnimation setTimingFunctions:[NSArray arrayWithObjects:
                                             [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault],
                                             [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault],
                                             [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
                                             nil]];
        bounceAnimation.fillMode = kCAFillModeForwards;
        bounceAnimation.removedOnCompletion = NO;
        [self.animatedLikeImageView.layer addAnimation:bounceAnimation forKey:@"bounce"];
    });
...