UIPanGestureRecognizer translationInView returning different values on iPhone/ipad

Question

Hi I have this bit of code in my project,

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    CGPoint translation = [scrollView.panGestureRecognizer translationInView:scrollView];
    if(translation.x < 0.0f) {
        // Something
    }
}  

and it works fine on iPhone, but for some reason on iPad, my CGPoint is always returning (0,0). Any ideas as to why?

Answer 1

I had the same problem, and came up with a nasty workaround, using the velocityInView() method instead. I don't have a real iPad, so I'm suspicious that the problem may actually be with the simulator.

Objective-C:

CGPoint velocity = [scrollView.panGestureRecognizer velocityInView: scrollView];
CGPoint translation = CGPointMake(velocity.x * 0.1, velocity.y * 0.1);

Swift:

let translation = scrollView.panGestureRecognizer.velocityInView(self) * 0.1

I'm using a very handy CGPoint extension you can find right here.