Flash/flicker UIView - iphone

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"];

Answer 2

Simple UIView animation; temporarily grows the view:
[UIView animateWithDuration:0.3 animations:^{
CGRect frm = view.frame;
frm.size.width += 20;
frm.size.height += 20;
frm.origin.x -= 10;
frm.origin.y -= 10;
view.frame = frm;
} completion:^{
[UIView animateWithDuration:0.3 animations:^{
CGRect frm = view.frame;
frm.size.width -= 20;
frm.size.height -= 20;
frm.origin.x += 10;
frm.origin.y += 10;
view.frame = frm;
}];
}];