CODE EXAMPLE FOR SWIFT

swift allow gesture recognizer over others

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, 
         shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
   // Do not begin the pan until the swipe fails. 
   if gestureRecognizer == self.swipeGesture && 
          otherGestureRecognizer == self.panGesture {
      return true
   }
   return false
}