How to code a screen tap to increment/decrement a value?

Question

Created May ’21

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I would like to have a label that when tapped once will increment by 1 (+1) or when double tapped will decrement by 1 (-1).

Suggestions? Ideas?

Thanks

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Answer 1

Claude31 OP

May ’21

Implement tapGesture on the label:

one with numberOfTapsRequired set to 1
another with numberOfTapsRequired set to 2

You can add them via the storyboard by dragging tap gestures on the label.

Connect each gesture to an IBAction, by control-drag from the IBAction to the corresponding gesture.

Code Block      @IBAction func handleLabelTap(recognizer:UITapGestureRecognizer) {
         print("Label Tapped")
        // Decrement the value
         value = label.text ?? 0
         value += 1
         label.text = String(value)
          var value = Int(label.text ?? "0") ?? 0
          value -= 2  // Because singletap will be fired first, need to compensate for the +1
          label.text = String(value)
     }
     
     @IBAction func handleLabelDoubleTap(recognizer:UITapGestureRecognizer) {
         print("Label Double Tapped")
        // Increment the value
          var value = Int(label.text ?? "0") ?? 0
          value += 1
          label.text = String(value)
     }

Very important: enable user interaction for the label

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