Simple iPhone motion detect

In viewDidAppear, become the first responder:

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

And make sure you can be first responder:

- (BOOL)canBecomeFirstResponder {
    return YES;
}

Then you can implement the motion detection.

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.subtype == UIEventTypeMotion){
        //there was motion
    }
}