CODEWITHSUNDEEP
iosswiftuigesturerecognizer
B. Wolf
B. Wolf

Reputation: 91

gestureRecognizerShouldBegin IS NOT being called

I have a UIPinchGestureRecognizer that allows a user to scale a UITextView. That all works with the following code: 

@IBAction func handlePinch(recognizer : UIPinchGestureRecognizer) {
    if let view = recognizer.view {
      view.transform = CGAffineTransformScale(view.transform,
        recognizer.scale, recognizer.scale)

        recognizer.scale = 1
    }
  }

However, I only want the user to be able to make the UITextView larger, not smaller. I have set my UIGestureRecognizerDelegate and have put in the following code:

func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    if let pinch = gestureRecognizer as? UIPinchGestureRecognizer {
        return pinch.scale < 1
    }
    return true
}

I got that code from this post here: UIPinchGestureRecognizer only for pinching out.

However, my method never gets called and it is not working. Any thoughts?

Upvotes: 5

Views: 6276

Answers (1)

LinusG.
LinusG.

Reputation: 28952

Make sure to include UIGestureRecognizerDelegate in your class declaration:

class ViewController: UIViewController, UIGestureRecognizerDelegate { /* ... */ }

Then, set your gestureRecognizer's delegate to self:

gestureRecognizer.delegate = self

Hope that helps :)

Upvotes: 12

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