UITextField - Create a textfield programmatically

Update - July 12, 2017 -  Xcode 8.3.3 & Swift 3.1
Update - October 13, 2015
1. Change the background color for various conditions.
2. Hide the keyboard while touching outside the text field.

Edit the ViewController.swift file as:


Update - July 12, 2017 -  Xcode 8.3.3 & Swift 3.1

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    

    var textField : UITextField!

    var label : UILabel!

    let str : String = "You have entered: "

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        //Color #1 - Initial color

        view.backgroundColor = UIColor.yellow

        

        let placeholder = NSAttributedString(string: "Enter here", attributes: [NSForegroundColorAttributeName: UIColor.lightGray])

        

        textField = UITextField(frame: CGRect(x: 50, y: 100, width: 200, height: 20))

        

        textField.attributedPlaceholder = placeholder

        textField.textColor = UIColor.black

        textField.delegate = self

        textField.borderStyle = UITextBorderStyle.roundedRect

        textField.clearsOnBeginEditing = true

        view.addSubview(textField)

        

        label = UILabel(frame: CGRect(x: 50, y: 200, width: 200, height: 20))

        label.text = str

        view.addSubview(label)

    }

    

    func textFieldDidBeginEditing(_ textField: UITextField) {
        //Color #2 - While selecting the text field

        view.backgroundColor = UIColor.purple

    }

    

    func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

        

        //Color #3 - While touching outside the textField.

        view.backgroundColor = UIColor.cyan

        

        //Hide the keyboard

        textField.resignFirstResponder()

    }

    

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        

        //Display the result.

        label.text = str+textField.text!

        

        //Color #4 - After pressing the return button

        view.backgroundColor = UIColor.orange

        textField.resignFirstResponder() //Hide the keyboard

        return true

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}

Update - October 13, 2015

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    var textField : UITextField!

    var label : UILabel!

    let str : String = "You have entered:"

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        //Color #1 - Initial color

        view.backgroundColor = UIColor.yellowColor()

        

        let placeholder = NSAttributedString(string: "Enter here", attributes: [NSForegroundColorAttributeName: UIColor.lightGrayColor()])

        

        textField = UITextField(frame: CGRectMake(50, 100, 200, 20))

        textField.attributedPlaceholder = placeholder

        textField.textColor = UIColor.blackColor()

        textField.delegate = self

        textField.borderStyle = UITextBorderStyle.RoundedRect

        textField.clearsOnBeginEditing = true

        view.addSubview(textField)

        

        label = UILabel(frame: CGRectMake(50, 200, 200, 20))

        label.text = str

        view.addSubview(label)

    }

    

    func textFieldDidBeginEditing(textField: UITextField) {

        

        //Color #2 - While selecting the text field

        view.backgroundColor = UIColor.purpleColor()

    }

    

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

        

        //Color #3 - While touching outside the textField.

        view.backgroundColor = UIColor.cyanColor()

        

        //Hide the keyboard

        textField.resignFirstResponder()

    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        

        //Display the result.

        label.text = str+textField.text

        

        //Color #4 - After pressing the return button

        view.backgroundColor = UIColor.orangeColor()

        

        textField.resignFirstResponder() //Hide the keyboard

        return true

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}

While editing the text field:

The result after hitting the return key: