Keyboard Helpers

ViewController.swift

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var yourBottomConstraint: NSLayoutConstraint!
  
    // MARK: - Lifecycle Methods
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // I'm Here...
    }
    
    override func viewWillAppear(_ animated: Bool) {
        self.registerForKeyboardNotifications()
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        self.deregisterFromKeyboardNotifications()
    }
    
    override func touchesBegan(_: Set<UITouch>, with: UIEvent?) {
        self.view.endEditing(true)
    }
    
    // MARK: - Keyboard Helpers
    func registerForKeyboardNotifications() {
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardNotification(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }
    
    func deregisterFromKeyboardNotifications() {
        NotificationCenter.default.removeObserver(self)
    }
    
    @objc func keyboardNotification(_ notification: Foundation.Notification) {
        if let userInfo = notification.userInfo {
            let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions().rawValue
            let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
            if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {
                self.scrollViewBottomConstraint?.constant = 24.0
            } else {
                self.scrollViewBottomConstraint?.constant = endFrame!.size.height + 10
            }
            UIView.animate(withDuration: duration,
                           delay: TimeInterval(0),
                           options: animationCurve,
                           animations: { self.view.layoutIfNeeded() },
                           completion: nil)
        }
    }
}