UIView surface custom transformation/animation (like 'a water drop effect')

Question

What is the way to implement custom transformation (+ animation) on a view surface (similar to the images attached) (not

Answer 1

You can use this:

- (void)drawWaterRippleAnimation {
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(200, 200, 100, 100)];
    view.backgroundColor = [UIColor blueColor];

    CATransition *animation=[CATransition animation];
    [animation setDelegate:self];
    [animation setDuration:1.75];
    [animation setTimingFunction:UIViewAnimationCurveEaseInOut];
    [animation setType:@"rippleEffect"];

    [animation setFillMode:kCAFillModeRemoved];
    animation.endProgress=1;
    [animation setRemovedOnCompletion:NO];
    [self.view.layer addAnimation:animation forKey:nil];
}

Credits goes to here.