IOS - How to hide a view by touching anywhere outs

问题:

I'm new to IOS programming, I'm displaying a view when a button is clicked, using the following code inside the button method.

 @IBAction func moreButton(_ sender: Any)
    {
        self.helpView.isHidden = false
    }

initially, the self.helpView.isHidden is set to true in viewDidLoad method to hide the view. Now, how can i dismiss this view by touching anywhere outside the view. From the research, i found that, it can be done by creating a transparent button that fits the whole viewController. So then by clicking on the button, we can make the view to dismiss. Can anyone give me the code in swift 3 to create such button.

Or, if there is any other better way to hide a view, it is welcomed.

I'm using Xcode 8.2, swift 3.0

Thanks in advance.

回答1:

In touch began you should write like

override func touchesBegan(_ touches: Set<AnyHashable>, withEvent event: UIEvent) {
    var touch: UITouch? = touches.first
    //location is relative to the current view
    // do something with the touched point
    if touch?.view != yourView {
        yourView.isHidden = true
    }
}

回答2:

You can use touchesBegan method for that:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    self.helpView.isHidden = true
}

回答3:

Inside the moreButton selected, you can do something like this

 @IBAction func moreButton(_ sender: Any)
    {
        self.helpView.isHidden = false
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissView))
        view.addGestureRecognizer(tap)
    }

    func dismissView() {
        self.helpView.isHidden = true
        self.view.removeGestureRecognizer(tap)
    }

回答4:

You could create another transparent button or, your base view (assuming it's a single view below the button) can then address what you're trying to do. First, you would need to make it tappable. Then you want to handle the logic for what happens when tapped, or untapped.

回答5:

You can achieve what you want doing the following (tested with Swift 4.1 and Xcode 9.3):

class ViewController: UIViewController {

    ...

    private var dismissViewTap: UITapGestureRecognizer?

    override func viewDidLoad() {

        super.viewDidLoad()

        dismissViewTap = UITapGestureRecognizer(target: self, action: #selector(dismissView))

        if let tap = dismissViewTap {

            view.addGestureRecognizer(tap)

        } // if let

    } // viewDidLoad

    @objc private func dismissView() {

        guard let tap = dismissViewTap else {

            return

        } // guard

        guard helpView.isHidden == false else {

            return

        } // guard

        helpView.isHidden = true

        view.removeGestureRecognizer(tap)

    } // dismissView

    ...

} // ViewController

If you want to keep the gesture recognizer (maybe because you open helpView more than once) change dismissView to this version:

...

@objc private func dismissView() {

    guard helpView.isHidden == false else {

        return

    } // guard

    helpView.isHidden = true

} // dismissView

...

That's all...!

回答6:

You can use this method in swift 4.

add the tag number to the uiview you want to add action

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)
{
    if touches.first?.view?.tag == 10{
        dismiss(animated: true, completion: nil)
        super.touchesEnded(touches , with: event)
    }
}

回答7:

In Swift 4

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
     let touch = touches.first
     if touch?.view == self.view {
        commentsTxtView.resignFirstResponder()
    }
}