iOS中的键盘处理

Question

I have an issue with my application. I am actually building a login page and I do not find how to handle the keyboard when a text field is active. I have two text fields in a view. In my superView, I have 3 views. One on the bottom, another on the middle and a last on top. The 3 views are embeded in a stack view.

I really want to shrink the stack view, in other words reduce the space between all 3 views only when the keyboard appears and set the size back when the keybaord disappear, like Facebook login page on iOS.

Answer 1

You need to subscribe to keyboard notifications and do this in viewDidLoad

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: .UIKeyboardWillHide, object: nil)

//

@objc func keyboardWillShow(notification: NSNotification) {
   self.stackV.spacing = 10
    UIView.animate(withDuration: 0.3, animations: { () -> Void in
        self.view.layoutIfNeeded()
    })
}

@objc func keyboardWillHide(notification: NSNotification) {
    self.stackV.spacing = // set back to default
    UIView.animate(withDuration: 0.3, animations: { () -> Void in
        self.view.layoutIfNeeded()
    })
}