How to hide keyboard in swift on pressing return key?

Question

You can make the app dismiss the keyboard using the following function

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    self.view.endEditing(true)
    return false
}

Here is a full example to better illustrate that:

//
//  ViewController.swift
//
//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var myTextField : UITextField

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

        self.myTextField.delegate = self
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return false
    }
}

Code source: http://www.snip2code.com/Snippet/85930/swift-delegate-sample

The return true part of this only tells the text field whether or not it is allowed to return.
You have to manually tell the text field to dismiss the keyboard (or what ever its first responder is), and this is done with resignFirstResponder(), like so:

// Called on 'Return' pressed. Return false to ignore.

func textFieldShouldReturn(_ textField: UITextField) -> Bool { 
    textField.resignFirstResponder()
    return true
}

Swift 4.2 - No Delegate Needed

You can create an action outlet from the UITextField for the "Primary Action Triggered" and resign first responder on the sender parameter passed in:

@IBAction func done(_ sender: UITextField) {
    sender.resignFirstResponder()
}

Super simple.

(Thanks to Scott Smith's 60-second video for tipping me off about this: https://youtu.be/v6GrnVQy7iA)

• Add UITextFieldDelegate to the class declaration:

  class ViewController: UIViewController, UITextFieldDelegate
  

• Connect the textfield or write it programmatically

  @IBOutlet weak var userText: UITextField!
  

• set your view controller as the text fields delegate in view did load:

  override func viewDidLoad() {
  super.viewDidLoad()
  self.userText.delegate = self
  }
  

• Add the following function

  func textFieldShouldReturn(userText: UITextField!) -> Bool {
      userText.resignFirstResponder()
      return true;
  }
  

  with all this your keyboard will begin to dismiss by touching outside the textfield aswell as by pressing return key.

I hate to add the same function to every UIViewController. By extending UIViewController to support UITextFieldDelegate, you can provide a default behavior of "return pressed".

extension UIViewController: UITextFieldDelegate{
    public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true;
    }
}

When you create new UIViewController and UITextField, all you have to do is to write one line code in your UIViewController.

override func viewDidLoad() {
    super.viewDidLoad()
    textField.delegate = self
}

You can even omit this one line code by hooking delegate in Main.storyboard. (Using "ctrl" and drag from UITextField to UIViewController)