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I'm trying to make an alert controller with message and input, and then get the value from the input. I've found many good tutorials on how to make the input text field, but I can't get the value from the alert.

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Updated for Swift 3 and above:

//1. Create the alert controller. let alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .alert) //2. Add the text field. You can configure it however you need. alert.addTextField { (textField) in textField.text = "Some default text" } // 3. Grab the value from the text field, and print it when the user clicks OK. alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { [weak alert] (_) in let textField = alert.textFields![0] // Force unwrapping because we know it exists. print("Text field: \(textField.text)") })) // 4. Present the alert. self.present(alert, animated: true, completion: nil)

Swift 2.x

Assuming you want an action alert on iOS:

//1. Create the alert controller. var alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .Alert) //2. Add the text field. You can configure it however you need. alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in textField.text = "Some default text." }) //3. Grab the value from the text field, and print it when the user clicks OK. alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { [weak alert] (action) -> Void in let textField = alert.textFields![0] as UITextField println("Text field: \(textField.text)") })) // 4. Present the alert. self.presentViewController(alert, animated: true, completion: nil)
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10 Comments

Hi @AndyIbanez I'm trying to implement your code on my app, however its stating the error "Use of undeclared identifier var" I'm new to Xcode so apologies if this is a basic error on my behalf
@Sjharrison My code is for Swift. The only reason I can think of that would cause you troubles with the var keyword is if you were writing in Objective-C.
Ahh i see! yeah I'm using Xcode, only been doing this a few hours so over tired and still learning!
Can anyone explain why the [weak alert]? I'm looking at Swift 3.
For Swift 3 alert in step 3. is optional, needed "?" let textField = alert?.textFields![0] // Force unwrapping because we know it exists. print("Text field: \(textField?.text)")
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54

Swift 5

You can use the below extension for your convenience.

Usage inside a ViewController:

showInputDialog(title: "Add number", subtitle: "Please enter the new number below.", actionTitle: "Add", cancelTitle: "Cancel", inputPlaceholder: "New number", inputKeyboardType: .numberPad, actionHandler: { (input:String?) in print("The new number is \(input ?? "")") })

The extension code:

extension UIViewController { func showInputDialog(title:String? = nil, subtitle:String? = nil, actionTitle:String? = "Add", cancelTitle:String? = "Cancel", inputPlaceholder:String? = nil, inputKeyboardType:UIKeyboardType = UIKeyboardType.default, cancelHandler: ((UIAlertAction) -> Swift.Void)? = nil, actionHandler: ((_ text: String?) -> Void)? = nil) { let alert = UIAlertController(title: title, message: subtitle, preferredStyle: .alert) alert.addTextField { (textField:UITextField) in textField.placeholder = inputPlaceholder textField.keyboardType = inputKeyboardType } alert.addAction(UIAlertAction(title: actionTitle, style: .default, handler: { (action:UIAlertAction) in guard let textField = alert.textFields?.first else { actionHandler?(nil) return } actionHandler?(textField.text) })) alert.addAction(UIAlertAction(title: cancelTitle, style: .cancel, handler: cancelHandler)) self.present(alert, animated: true, completion: nil) } }
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4 Comments

just note that if you are going to present "Add" action make sure the style if "default" not "destructive" -- alert.addAction(UIAlertAction(title: actionTitle, style: .default ...
@Gunhan How to assign delegate for the textfield?
@VaibhavJhaveri just add one more parameter to the function e.g. delegate: UITextFieldDelegate? = nil, and inside the function where we add the textfield assign it e.g. textField.delegate = delegate
@Gunhan That worked. However, the text field is displayed with it being the first responder. I want to turn that off. how can I do that? I want to open custom view when I click on the textfield
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In Swift5 ans Xcode 10

Add two textfields with Save and Cancel actions and read TextFields text data

func alertWithTF() { //Step : 1 let alert = UIAlertController(title: "Great Title", message: "Please input something", preferredStyle: UIAlertController.Style.alert ) //Step : 2 let save = UIAlertAction(title: "Save", style: .default) { (alertAction) in let textField = alert.textFields![0] as UITextField let textField2 = alert.textFields![1] as UITextField if textField.text != "" { //Read TextFields text data print(textField.text!) print("TF 1 : \(textField.text!)") } else { print("TF 1 is Empty...") } if textField2.text != "" { print(textField2.text!) print("TF 2 : \(textField2.text!)") } else { print("TF 2 is Empty...") } } //Step : 3 //For first TF alert.addTextField { (textField) in textField.placeholder = "Enter your first name" textField.textColor = .red } //For second TF alert.addTextField { (textField) in textField.placeholder = "Enter your last name" textField.textColor = .blue } //Step : 4 alert.addAction(save) //Cancel action let cancel = UIAlertAction(title: "Cancel", style: .default) { (alertAction) in } alert.addAction(cancel) //OR single line action //alert.addAction(UIAlertAction(title: "Cancel", style: .default) { (alertAction) in }) self.present(alert, animated:true, completion: nil) }

For more explanation https://medium.com/@chan.henryk/alert-controller-with-text-field-in-swift-3-bda7ac06026c

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How to assign delegate for the textfield?
14

Swift version: 5.+

Create a new TextField variable in current scope and assign it to alertTextField in alert.addTextField completion handler. Use textField's value inside UIAlertAction completion handler.

@IBAction func addButtonPressed(_ sender: UIBarButtonItem) { //Variable to store alertTextField var textField = UITextField() let alert = UIAlertController(title: "Add new item", message: "", preferredStyle: .alert) alert.addTextField { alertTextField in alertTextField.placeholder = "Create new item" //Copy alertTextField in local variable to use in current block of code textField = alertTextField } let action = UIAlertAction(title: "Add item", style: .default) { action in //Prints the alertTextField's value print(textField.text!) } alert.addAction(action) present(alert, animated: true, completion: nil) }
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let ac = UIAlertController(title: "title", message: "message", preferredStyle: .alert) ac.addTextField() let submitAction = UIAlertAction(title: "Submit", style: .default) { [weak self, weak ac] action in guard let wordToget = ac?.textFields?[0].text else { return } //here you can do what you need like print(wordToget) } ac.addAction(submitAction) present(ac, animated: true)
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