CODEWITHSUNDEEP
iosswiftuigesturerecognizer
Zaira Zafar
Zaira Zafar

Reputation: 108

GestureRecogniser doesn't respond

Beginner here- the below code works fine in TouchesBegan function. But doesn't work with GestureRecongnizer (swipe or tap). It seems like the gesture recognizer doesn't respond at all.

I'm working on swift 2 and xcode 7.3

override func viewDidLoad()
{ ...
let SwipeUp = UISwipeGestureRecognizer(target: self, action:#selector(ViewController.Dragged(_:)))
   SwipeUp.direction = UISwipeGestureRecognizerDirection.Up
    self.egg.addGestureRecognizer(SwipeUp)
 }
  func Dragged(gesture: UIGestureRecognizer)
{
     UIView.animateWithDuration(0.4, delay: 1.0, options: .CurveEaseOut, animations: {
        let eggFrame = self.egg.frame
        eggFrame.origin.y -= 700
        self.egg.frame = eggFrame
        }, completion: { finished in print("done!") } 
}

Upvotes: 0

Views: 97

Answers (2)

rosem
rosem

Reputation: 1378

You need to keep a strong reference to the UIGestureRecognizer.

var swipeUp: UISwipeGestureRecognizer!

override func viewDidLoad() {
    swipeUp = UISwipeGestureRecognizer(target: self, action:#selector(ViewController.Dragged(_:)))
    swipeUp.direction = UISwipeGestureRecognizerDirection.Up
    self.egg.addGestureRecognizer(swipeUp)
}

func Dragged(gesture: UIGestureRecognizer) {
    UIView.animateWithDuration(0.4, delay: 1.0, options: .CurveEaseOut, animations: {
        let eggFrame = self.egg.frame
        eggFrame.origin.y -= 700
        self.egg.frame = eggFrame
    }, completion: { finished in print("done!") } 
}

Upvotes: 1

João Pedro Junqueira Candido
João Pedro Junqueira Candido

Reputation: 111

The UISwipeGestureRecognizer only recognizes swipe gestures on the element you attached it to (the egg). If you do a rapid swipe up in the egg view it should recognize the swipe.

If you want to add Drag or Tap gesture recognizers, you have to add UIPanGestureRecognizer or UITapGestureRecognizer to the egg.

Are you sure that the Dragged method is not being called?

Upvotes: 0

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