Check if a UIGestureRecognizer has been added

recognizerhelper.swift

func containsGestureRecognizer(recognizers: [UIGestureRecognizer]?, find: UIGestureRecognizer) -> Bool {
   if let recognizers = recognizers {
       for gr in recognizers {
           if gr == find {
               return true
           }
       }
   }
   return false
}