如何在Tap Swift4上关闭UIView

Question

I have a UIView that is showed every time I press a button in another view

@IBOutlet weak var view1: UIView!
@IBOutlet weak var view2: UIView! 

@IBAction func showView(_ sender: Any) {
    view2.isHidden = false
}

What I want is to add a tap gesture that allows me to hide view2 every time I tap outside of the view and, since those views are draggable, I want the second view not to be tappable when hidden ( so that if I touch under my view I don't risk to move it. This is what I tried:

1.  var gesture : UITapGestureRecognizer? override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default.addObserver(self, selector: #selector(closeView), name: NSNotification.Name("CloseView"), object: nil) gesture = UITapGestureRecognizer(target: self, action: #selector(ViewController.closeView)) } @objc func closeView() { if view2.isHidden == false { view2.isUserInteractionEnabled = true view2.isHidden = false self.view.removeGestureRecognizer(gesture!) } else { view2.isHidden = true view2.isUserInteractionEnabled = true self.view.addGestureRecognizer(gesture!) } } 

2.  let closeTapGesture = UITapGestureRecognizer(target: view, action: #selector(getter: view2.isHidden) view.addGestureRecognizer(closeTapGesture) 

None of this work, how can I do?

Answer 1

Your tap gesture should only handle closeView .

@objc func closeView() {
        view2.isHidden = true
        view2.isUserInteractionEnabled = false
        gesture?.isEnabled = false
    }

And the the button click to show your view2 should call this.

func  showView() {
    view2.isHidden = false
    view2.isUserInteractionEnabled = true
    gesture?.isEnabled = true
}

Answer 2

You need to check if you actually tapped outside of view2:

    var gesture : UITapGestureRecognizer?

    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(closeView), name: NSNotification.Name("CloseView"), object: nil)


        let gesture = UITapGestureRecognizer(target: self, action: #selector(closeView(_:)))
        view.addGestureRecognizer(gesture)
        self.gesture = gesture
    }

    @objc private func closeView(_ tapGestureRecognizer: UITapGestureRecognizer) {
        let location = tapGestureRecognizer.location(in: view2)
        guard view2.isHidden == false,
              !view2.bounds.contains(location) else {  //We need to have tapped outside of view 2
            return
        }
        view2.isHidden = true
    }