UIGesturerecognizer is not working on UIView

Question

When I am tapping on UIView but Gesture is not working.

override func viewDidLoad() {
        super.viewDidLoad()

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        viewForSHadow.isUserInteractionEnabled = true
        viewForSHadow.addGestureRecognizer(tap)

        // Do any additional setup after loading the view.
    }


func handleTap(_sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
        viewForSHadow.isHidden = true
        viewForAlert.isHidden = true
    }

I just want to perform this action on UIView tap.

do you have an UIImageCiew on top of the view or something that can consume the gesture? — m1sh0, May 31 '19 at 09:42
Where have you added viewForSHadow and what are the constraints you've added? — RajeshKumar R, May 31 '19 at 10:16
once you will tap, your view will hide it's seems in your code. so your tap work only first time — Ahemadabbas Vagh, May 31 '19 at 10:28
@Coding once try to put code in viewWillAppear() and check, if not working share details for viewForSHadow how you initialised it. — guru, May 31 '19 at 15:05

score 3 · Accepted Answer · answered May 31 '19 at 10:29

3

You may check in the debug view hierarchy if anything with alpha = 0 is overlapping your viewForSHadow.

answered May 31 '19 at 10:29

R. Shah

56
4

Bhavik Modi · Answer 2 · 2019-05-31T09:51:45.820

1

You have to implement as follows:

    class ViewController: UIViewController, UIGestureRecognizerDelegate {

...

    override func viewDidLoad() {
        super.viewDidLoad()
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTap(_sender:)))
        viewForSHadow.isUserInteractionEnabled = true
        viewForSHadow.addGestureRecognizer(tap)
    }

    @objc func handleTap(_sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
        viewForSHadow.isHidden = true
        viewForAlert.isHidden = true
    }
...

}

edited May 31 '19 at 09:51

answered May 31 '19 at 09:46

Bhavik Modi

1,517
14
29

2

what is the use of `delegate` here and are you seen the code this once you pressed the gesture user hide the `viewForSHadow.isHidden = true` – Anbu.Karthik May 31 '19 at 09:48
the delegate is not needed here at all! – m1sh0 May 31 '19 at 09:50
Yes, delegate is not required. @Anbu.Karthik I have just used Coding's code to make tap gesture working. – Bhavik Modi May 31 '19 at 09:54
@BhavikModi - but if user clicked the view he hidden the own view – Anbu.Karthik May 31 '19 at 10:02
@Anbu.Karthik We don't know what exactly Coding wants :) You can ask him directly. – Bhavik Modi May 31 '19 at 10:05
What you have tried and what is not working? I have already tested this and working fine. – Bhavik Modi May 31 '19 at 10:29

score 1 · Answer 3 · answered May 31 '19 at 09:54

Your code is more than enough to have working UIGestureRecognizer, you should check some other stuff like, is there something else that can consume the user interaction. And also to check if you use

isUserInteractionEnabled = false

to some parent view of viewForSHadow.

score 1 · Answer 4 · answered Mar 04 '20 at 10:22

You have to use UIGestureRecognizerDelegate

let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleDismiss))
        tapRecognizer.delegate = self
        blackView.addGestureRecognizer(tapRecognizer)

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    return true
}

@objc func handleDismiss() {
        print("handleDismiss")
}

Reference

Don't forget to set the UIGestureRecognizerDelegate in your class

Ankush Bhatia · Answer 5 · 2019-05-31T10:10:42.537

0

You need to mention numberOfTapsRequired property of the UITapGestureRecognizer.

override func viewDidLoad() {
    super.viewDidLoad()
    let tap = UITapGestureRecognizer(target: self, action: #selector(handleTapGesture(_sender:)))
    tap.numberOfTapsRequired = 1
    viewForSHadow.isUserInteractionEnabled = true
    viewForSHadow.addGestureRecognizer(tap)
}

@objc func handleTapGesture(_sender: UITapGestureRecognizer) {
    print("---------View Tapped--------")
    // Why are you hiding this view **viewForSHadow**
    viewForSHadow.isHidden = true
    viewForAlert.isHidden = true
}

Also, make sure you are not doing viewForSHadow.isUserInteractionEnabled = false anywhere in the code.

edited May 31 '19 at 10:10

answered May 31 '19 at 09:58

Ankush Bhatia

163
8

sorry, not agree with you, numberOfTapRequired have default value 1, this is the reason why this can't be the problem. https://developer.apple.com/documentation/uikit/uitapgesturerecognizer/1623581-numberoftapsrequired – m1sh0 May 31 '19 at 10:02
Can you check if you are not doing ```viewForSHadow.isUserInteractionEnabled = false``` anywhere? – Ankush Bhatia May 31 '19 at 10:11

score 0 · Answer 6 · answered May 31 '19 at 11:23

First of all you code doesn't compile. The handleTap(_:) signature must be like:

@objc func handleTap(_ sender: UITapGestureRecognizer) {
    print("---------View Tapped--------")
}

Secondly, you need to first try with the minimal code in a separate project. And by minimal code I mean what you've added in the question.

class ViewController: UIViewController {
    @IBOutlet weak var viewForSHadow: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        viewForSHadow.addGestureRecognizer(tap)
    }

    @objc func handleTap(_ sender: UITapGestureRecognizer) {
        print("---------View Tapped--------")
    }
}

Try with just the above code and see if you can get it working. The above code is working well at my end without any delegate or numberOfTaps.

UIGesturerecognizer is not working on UIView

6 Answers6