Question

I need to give some stretch & skew animation to a UIView upon pressing a button or completion of a task.

Most of the animation applied to UIView are usually applied when they are added to or removed from a UIView but how can I accomplish that with a view already added to view.

Animation could be anything as long as it catches users attention (to indicate that the task was completed).

Answer 1

EDIT How to scale and rotate a view in a single animation

You might need use Core Animation and add both animations in a group:

CABasicAnimation *stetchAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
stetchAnimation.toValue = [NSNumber numberWithDouble:(someView.frame.size.width+100)/someView.frame.size.width];

CABasicAnimation *skewAnimation = CABasicAnimation animationWithKeyPath:@"transform.rotation.x"];
stetchAnimation.toValue:[NSNumber numberWithInt:180];

//Add both animation at time when task is completed

CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.animations = [NSArray arrayWithObjects:stetchAnimation,skewAnimation,nil];
animationGroup.removedOnCompletion = YES;
animationGroup.fillMode = kCAFillModeForwards;
animationGroup.duration = 0.7; // increase duration if needed

[someView.layer addAnimation:animationGroup forKey:@"animations"];