shake gesture iphone

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"Begin");
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"cancel motion");
}
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    NSLog(@"end");
}
- (BOOL)canBecomeFirstResponder {
    return YES;
}

if not work then add

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