How do I detect when someone shakes an iPhone?

Question

I want to react when somebody shakes the iPhone. I don\'t particularly care how they shake it, just that it was waved vigorously about for a split second. Does anyone know h

Answer 1

First off, I know this is an old post, but it is still relevant, and I found that the two highest voted answers did not detect the shake as early as possible. This is how to do it:

1. Link CoreMotion to your project in the target's build phases:

2. In your ViewController:

   - (BOOL)canBecomeFirstResponder {
       return YES;
   }
   
   - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
   {
       if (motion == UIEventSubtypeMotionShake) {
           // Shake detected.
       }
   }