Once overrode touchesEnded never end even in another class or view

I suppose you add your gesture with addGestureRecognizer to the view in viewDidLoad (or viewWillAppear) of the second controller ?

Do you removeGestureRecognizer when you leave the view, before returning and leaving the view ?

Do you unwind segue or do you have a new segue to return to first controller ?

I think you should not have the problem with unwindSegue, because the second controller is then deleted as well as the gesture ; otherwise, the new view (1) is stacked over the previous (2) and probably messages are passed to down the chain.

Thanks for your reply.

I'm not using Apple's gesture recognizer, I can't use them for what I need. That's why I'm overriding touchesBegan and the other, I'm doing it by myself from coordinates of gestures.

Here is a sample of what I do, maybe you'll understand better what I mean.

import UIKit

    class SecondViewController: UIViewController {
    //Variables definition

    override func viewDidLoad() {
        super.viewDidLoad()
        ascending = false
        UIScreen.main.wantsSoftwareDimming = true
        UIScreen.main.brightness = (0.0)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.timer.invalidate()
        isPinched = false
        super.touchesBegan(touches, with: event)
        startTime = getCurrentMillis()
     
        for touch in touches{
            let point = touch.location(in: self.view)
            for (index,finger)  in fingers.enumerated() {
                if finger == nil {
                    fingers[index] = String(format: "%p", touch)
                 
                    if (finger1.isEmpty){
                        finger1 = [point.x, point.y]
                    }
                    //And so on until finger10
                    break
                }
            }
        }
     
        //If the gesture is long enough, I have a special recognition (longPress)

        timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: #selector(increaseValue), userInfo: nil, repeats: true)
        if ascending {
            ascending = false
        }
        else {
            ascending = true
        }
    }


    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesMoved(touches, with: event)
     
        for touch in touches {
            let point = touch.location(in: self.view)
            for (index,finger) in fingers.enumerated() {
                if let finger = finger, finger == String(format: "%p", touch) {
                    switch (index){
                    case 0 :
                        finger1 += [point.x, point.y]
                    //And so on until case 9 / finger10
                    default :
                        break
                    }
                }
            }
        }
    }


    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        endTime = getCurrentMillis()
     
        for touch in touches {
            for (index,finger) in fingers.enumerated() {
                if let finger = finger, finger == String(format: "%p", touch) {
                    fingers[index] = nil
                    break
                }
            }
        }
     
        direction[0] = ""
        direction[1] = ""
        direction[2] = ""
        direction[3] = ""
        direction[4] = ""
     
        if finger1.count != 0 {
            direction[0] = GestureRecognizer(coordinates: finger1, index: 0)
        }
        if finger2.count != 0 {
            direction[1] = GestureRecognizer(coordinates: finger2, index: 1)
        }
        if finger3.count != 0 {
            direction[2] = GestureRecognizer(coordinates: finger3, index: 2)
        }
        if finger4.count != 0 {
            direction[3] = GestureRecognizer(coordinates: finger4, index: 3)
        }
        if finger5.count != 0 {
            direction[4] = GestureRecognizer(coordinates: finger5, index: 4)
        }
     
     
        if Int64(endTime - startTime) < 600 {

       //////////// HERE IS THE GESTURE RECOGNITION\\\\\\\\\\\\


            if !finger1.isEmpty && !finger2.isEmpty && !finger3.isEmpty && !finger4.isEmpty && ((((finger1[0] <= finger3[0] + 60) && (finger1[0] >= finger3[0] - 60 )) && ((finger1[1] <= finger3[1] + 60) && (finger1[1] >= finger3[1] - 60 ))) && (((finger2[0] <= finger4[0] + 60) && (finger2[0] >= finger4[0] - 60 )) && ((finger2[1] <= finger4[1] + 60) && (finger2[1] >= finger4[1] - 60 )))) {
                labelUpdate = "double tap 2 fingers"
                doubleTap2()
            }
            else if !finger1.isEmpty && !finger2.isEmpty && !finger3.isEmpty && !finger4.isEmpty && ((((finger1[0] <= finger4[0] + 60) && (finger1[0] >= finger4[0] - 60 )) && ((finger1[1] <= finger4[1] + 60) && (finger1[1] >= finger4[1] - 60 ))) && (((finger2[0] <= finger3[0] + 60) && (finger2[0] >= finger3[0] - 60 )) && ((finger2[1] <= finger3[1] + 60) && (finger2[1] >= finger3[1] - 60 )))) {
                labelUpdate = "double tap 2 fingers"
                doubleTap2()
            }
           // and so on
        }
     
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
            self.directionLabel.text = self.labelUpdate
            self.finger1 = []
            self.finger2 = []
            self.finger3 = []
            self.finger4 = []
            self.finger5 = []
            self.finger6 = []
            self.finger7 = []
            self.finger8 = []
            self.finger9 = []
            self.finger10 = []
        }
    }

    //One of the function I call
    func swipeLeftTwo(){
        request(urlAdress: "Url Adress")
    }

    func swipeRightFour(){
            self.performSegue(withIdentifier: "SecondViewController", sender:self)
    }
}

Is it better ?

OK.

I believe (it's been some time I did not look at this) that the touches are passed with events in the responder chain.

Did you try the unwindSegue ?

Or you could also intercept the touches in the first controller (overriding touches)

I did that already :

import UIKit
class ViewController: UIViewController {
   
    @IBOutlet weak var StatusLab: UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()
        StatusLab.text = "Test"
        /
    }
   
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        /
    }
   
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches , with:event)
    }
   
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesMoved(touches , with:event)
    }
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches , with:event)
    }
}

But I don't know what else I can do... How do I handle that ?

I did not try the unwindSegue, i will.

Ok, I just watch what unwindSegue was, and that's not a solution for me as, for now I've only 2 view controller, but later I'll have up to 7 differents views and I'd like to pass throught them indifferently...

The problem is that you will end stacking a lot of controllers.

Could have a look here, to unload the controller after segue.

h ttps://stackoverflow.com/questions/12867711/remove-last-uiviewcontroller-after-modal-segue

Ok, I can't test much more for today, but I think I've something with:

self.dismiss(animated: true, completion: nil)

Thank you much for your time and advices!
Hope I've found the right thing 🙂

Let us know when that works.

I remember viewing a tutorial explaining in detail this stacking or dismissing of view controllers after segue (Stanford course ?).

Hi,

So I had more time today to try.

When using :

self.dismiss(animated: true, completion: nil)
self.performSegue(withIdentifier: "SecondViewController", sender:self)

I have no problem of gesture recognition anymore, but, it doesn't show the viewController I want, it goes back to the previous one is that a normal behavior ?

Plus I've this warning in the console :

Warning: Attempt to present <APP.ViewController: 0x100c36bc0> on <APP.SecondViewController: 0x100c33320> whose view is not in the window hierarchy!

Don't really understand why, as, with a few researches, I've seen the same problem but people were trying to do so in the viewDidLoad() function, that's not my case.

I've searched a bit and found something with :

weak var pvc = self.presentingViewController
self.dismiss(animated: true) {
     pvc?.performSegue(withIdentifier: "SecondViewController", sender: nil)
}

But that's not working 😟

I would try to put the performSegue in the completion handler.

Something like :

self.dismiss(animated: true, completion: { self.performSegue(withIdentifier: "SecondViewController", sender:self) } )

Otherwise, the dismiss deletes the controller : this returns you to the previous one, and performSegue is not executed.

Edited: I see that's very similar to what you have just tried.

Yes, that does exactly the same thing as what I alredy tried, it's going back to the previous viewController and not the one I'm aiming.

Just to check:

- which controller would you like to go to after dismissing ?

- Is it the one pointed to by Identifier: "SecondViewController"