Move UIView up when the keyboard appears in iOS

Question

I have a UIView, it is not inside UIScrollView. I would like to move up my View when the keyboard appears. Before I tried to use this solution: How can I make a UITextField

Answer 1

Based on theDunc's answer but written in Swift with Autolayout.

@IBOutlet weak var bottomConstraint: NSLayoutConstraint! // connect the bottom of the view you want to move to the bottom layout guide

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    NSNotificationCenter.defaultCenter().addObserver(self,
                                                     selector: #selector(ConversationViewController.keyboardWillShow(_:)),
                                                     name: UIKeyboardWillShowNotification,
                                                     object: nil)

    NSNotificationCenter.defaultCenter().addObserver(self,
                                                     selector: #selector(ConversationViewController.keyboardWillHide(_:)),
                                                     name: UIKeyboardWillHideNotification,
                                                     object: nil)
}

override func viewWillDisappear(animated: Bool) {
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
    super.viewWillDisappear(animated)
}

// MARK: - Keyboard events

func keyboardWillShow(notification: NSNotification) {
    if let userInfo = notification.userInfo,
        keyboardFrame = userInfo[UIKeyboardFrameBeginUserInfoKey]
    {
        let keyboardSize = keyboardFrame.CGRectValue().size
        self.bottomConstraint.constant = keyboardSize.height
        UIView.animateWithDuration(0.3) {
            self.view.layoutIfNeeded()
        }
    }
}

func keyboardWillHide(notification: NSNotification) {
    self.bottomConstraint.constant = 0
    UIView.animateWithDuration(0.3) {
        self.view.layoutIfNeeded()
    }
}