In this short Swift code example we will create an Alert dialog message with Ok and Cancel buttons as well as one UITextField to let user input their ID.

• Create UIAlertController
• Create OK and Cancel buttons with Action handlers
• Add UITextField to UIAlertController
• Handle OK button action to display text user has entered into UITextField

  
              
 import UIKit

class ViewController: UIViewController, UITextFieldDelegate  {

override func viewDidLoad() {
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    var userIdTextField: UITextField?
    
    // Declare Alert message
    let dialogMessage = UIAlertController(title: "Alert Title", message: "Please provide your ID", preferredStyle: .alert)
    
    // Create OK button with action handler
    let ok = UIAlertAction(title: "OK", style: .default, handler: { (action) -> Void in
        print("Ok button tapped")
        
        if let userInput = userIdTextField!.text {
            print("User entered \(userInput)")
        }
    })
    
    // Create Cancel button with action handlder
    let cancel = UIAlertAction(title: "Cancel", style: .cancel) { (action) -> Void in
        print("Cancel button tapped")
    }
    
    //Add OK and Cancel button to dialog message
    dialogMessage.addAction(ok)
    dialogMessage.addAction(cancel)
    
    // Add Input TextField to dialog message
    dialogMessage.addTextField { (textField) -> Void in
        
        userIdTextField = textField
        userIdTextField?.placeholder = "Type in your ID"
    }
    
    // Present dialog message to user
    self.present(dialogMessage, animated: true, completion: nil)
}
}

[raw_html_snippet id=”cookbookpagecoursesheader”]

Unit Testing Swift Mobile App

Apply Test-Driven Development(TDD) process to iOS mobile app development in Swift Preview this video course.