Keyboard, textField and label disappear

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
 func textFieldShouldReturn(_ textField: UITextField) -> Bool {
 return false
 @IBOutlet weak var writeYouNameTextField: UITextField!
 @IBOutlet weak var displayLabel: UILabel!
 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
@IBAction func enterButton(_ sender: UIButton) {
 displayLabel.text = "hello " + writeYouNameTextField.text! + "!"
 writeYouNameTextField.text = ""

 override func viewDidLoad() {
 // Do any additional setup after loading the view, typically from a nib.

 override func didReceiveMemoryWarning() {
 // Dispose of any resources that can be recreated.

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