Show/Hide the keyboard while using the UITextView/UITextField

To show the keyboard:

self.inputTextView.becomeFirstResponder()

To hide the keyboard:

self.inputTextView.resignFirstResponder()

To hide the keyboard while tapping outside the UITextField/UITextField:

@IBOutlet weak var inputTextView: UITextView!

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {

        self.inputTextView.resignFirstResponder()

    }

To hide the keyboard while tapping the return key in the UITextField:

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var inputTextField: UITextField!

    

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        textField.resignFirstResponder()

        return true

    }

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        self.inputTextField.delegate = self

Link:
Create a text field programmatically