UIButton on iPhone — making the button shake or wiggle

Question

I have been working on this for a few days with no luck... I am using Interface Builder to build the views. I have a UIButton with an image as the background. When I shake the iPhone, I want the button to wiggle. Any ideas?

Answer 1

Wobbling effect code here: how to create iphone's wobbling icon effect?.

There are examples of shake detection in Apple sample code so I won't repeat it here. You'll want to set a threshold for how hard you want it shaken (and maybe in what direction, if you care). Once it reaches that point then just trigger the routine that kicks off the animation effect. You may want to turn off shake detection once it's started and then turn it back on in the animation completion handler.

Answer 2

I presume you'd have to change the CGRect defining the frame in which the button is drawn.