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== Beispiele ==
<syntaxhighlight lang="swift">
//
// ViewController.swift
// UIAlert Demo
//
// Created by Stephan Schlegel on 08.01.23.
//

import UIKit

class ViewController: UIViewController, CustomAlertDelegate {

let customAlert = CustomAlert()

@IBOutlet weak var label: UILabel!

override func viewDidLoad() {
super.viewDidLoad()
customAlert.delegate = self // catch up delegate of custom alert
}

@IBAction func buttonTapped(_ sender: UIButton) {
print("Button \(sender.tag) tapped")

/**
Note that showInput1 and showInput2 gives an Constraint Error in XCode 14
when they open (maybe a bug as it's the normal implementation.
The customAlert gives none because of it's
translatesAutoresizingMaskIntoConstraints = false
but this means it have to set it's own constrains
*/
if sender.tag == 1{
showAlert()
}else if sender.tag == 2{
showSelection()
}else if sender.tag == 3 {
showInput1()
}else if sender.tag == 4 {
showInput2()
}else if sender.tag == 5 {
showCustomAlert()
}
}

func alertDidDismissWithInput(_ input: String?) {
// Handle the input here
if(input != nil){
print("user input: \(input ?? "")")
label.text = "Your input: \(input ?? "")"
}
}

private func showAlert(){
let alertController = UIAlertController(title: "Error", message: "Invalaid email address", preferredStyle: .alert)
let dismissAction = UIAlertAction.init(title: "Dismiss", style: .default)
alertController.addAction(dismissAction)
present(alertController, animated: true, completion: nil)
}

private func showSelection(){
let alertController = UIAlertController(title: "Confirmation", message: "Select an item", preferredStyle: .alert)
let appleAction = UIAlertAction(title: "Apple ????", style: .default){ _ in
self.label.text = "Eating apples ????"
}
let orangeAction = UIAlertAction(title: "Orange ????", style: .default){ _ in
self.label.text = "Eating an orange ????"
}
let cherryAction = UIAlertAction(title: "Cherry ????", style: .default){ _ in
self.label.text = "Eating cherries ????"
}
alertController.addAction(appleAction)
alertController.addAction(orangeAction)
alertController.addAction(cherryAction)
present(alertController,animated: true,completion: {
print("selection done")
})
}

private func showInput1(){
let alertController = UIAlertController(title: "Text-Eingabe", message: "Gib deinen Namen ein:", preferredStyle: .alert)
// add text field
alertController.addTextField { (textField) in
textField.placeholder = "Name"
}
let okAction = UIAlertAction(title: "OK", style: .default) { (action) in
let name = alertController.textFields?[0].text
print("Dein Name ist: \(name ?? "na")")
}

alertController.addAction(okAction)

present(alertController, animated: true, completion: nil)
}

private func showInput2(){
let alertController = UIAlertController(title: "Login", message: "Enter name and password", preferredStyle: .alert)
alertController.addTextField(configurationHandler: nil)
alertController.addTextField{ textField in
textField.isSecureTextEntry = true
}
let okAction = UIAlertAction(title: "OK", style: .default){ _ in
var _name = String()
var _password = String()

if let nameTextField = alertController.textFields?.first,
let name = nameTextField.text{
_name = name
}
if let passwordTextField = alertController.textFields?.last,
let password = passwordTextField.text{
_password = password
}
self.label.text = _name + " " + _password
}
alertController.addAction(okAction)
present(alertController, animated: true)
}

private func showCustomAlert() {
self.customAlert.alertTitle = "Custom Alert"
present(self.customAlert, animated: true, completion: nil)
}
}

</syntaxhighlight>

<syntaxhighlight lang="swift">
//
// CustomAlert.swift
// UIAlert Demo
//
// Created by Stephan Schlegel on 10.01.23.
//

import UIKit

// protocol for delegate pattern
protocol CustomAlertDelegate: AnyObject {
func alertDidDismissWithInput(_ input: String?)
}

class CustomAlert: UIViewController {
weak var delegate: CustomAlertDelegate?

// Code for creating UI elements
var alertTitle: String?
var inputTextField: UITextField?
var okButton: UIButton?
var dismissButton: UIButton?

override func viewDidLoad() {
super.viewDidLoad()

// Create the alert title label
let titleLabel = UILabel()
titleLabel.text = alertTitle
titleLabel.textAlignment = .center
titleLabel.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(titleLabel)

// Create the text input field
inputTextField = UITextField()
inputTextField?.placeholder = "Enter some text"
inputTextField?.borderStyle = .roundedRect
inputTextField?.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(inputTextField!)

// Create the "OK" button
okButton = UIButton(type: .system)
okButton?.backgroundColor = .systemFill
okButton?.setTitleColor(.white, for: .normal)
okButton?.setTitle("OK", for: .normal)
okButton?.titleLabel?.textAlignment = .center
okButton?.layer.borderWidth = 1
okButton?.layer.borderColor = UIColor.black.cgColor
okButton?.addTarget(self, action: #selector(okButtonTapped), for: .touchUpInside)
okButton?.translatesAutoresizingMaskIntoConstraints = false
//view.addSubview(okButton!)

// Create the "Dismiss" button
dismissButton = UIButton(type: .system)
dismissButton?.backgroundColor = .systemFill
dismissButton?.setTitleColor(.white, for: .normal)
dismissButton?.setTitle("Dismiss", for: .normal)
dismissButton?.titleLabel?.textAlignment = .center
dismissButton?.layer.borderWidth = 1
dismissButton?.layer.borderColor = UIColor.black.cgColor
dismissButton?.addTarget(self, action: #selector(dismissButtonTapped), for: .touchUpInside)
dismissButton?.translatesAutoresizingMaskIntoConstraints = false
//view.addSubview(dismissButton!)

// Create a stack view to hold the buttons
let stackView = UIStackView(arrangedSubviews: [okButton!, dismissButton!])
stackView.axis = .horizontal
stackView.spacing = 20
stackView.distribution = .fillEqually

stackView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stackView)
// Set the background color of the alert
//view.backgroundColor = UIColor.lightGray

// Add constraints to position the elements in the alert
// constraint need to be add in detail
let margins = view.layoutMarginsGuide

NSLayoutConstraint.activate([
titleLabel.topAnchor.constraint(equalTo: margins.topAnchor, constant: 20),
titleLabel.leadingAnchor.constraint(equalTo: margins.leadingAnchor),
titleLabel.trailingAnchor.constraint(equalTo: margins.trailingAnchor),

inputTextField!.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 20),
inputTextField!.leadingAnchor.constraint(equalTo: margins.leadingAnchor, constant: 20),
inputTextField!.trailingAnchor.constraint(equalTo: margins.trailingAnchor, constant: -20),

// Add constraints to position the stack view

stackView.topAnchor.constraint(equalTo: inputTextField!.bottomAnchor, constant: 20),
stackView.leadingAnchor.constraint(equalTo: margins.leadingAnchor, constant: 20),
stackView.trailingAnchor.constraint(equalTo: margins.trailingAnchor, constant: -20)
])
}

@objc func okButtonTapped() {
let input = inputTextField!.text
delegate?.alertDidDismissWithInput(input)
self.dismiss(animated: true, completion: nil) // close modal
}

@objc func dismissButtonTapped() {
delegate?.alertDidDismissWithInput(nil)
self.dismiss(animated: true, completion: nil) // close modal
}

/**
when the user taps the "OK" button, the custom alert will pass the user input to the `alertDidDismissWithInput` method of the view controller by calling `delegate?.alertDidDismissWithInput(input)`.
When user taps the "Dismiss" button, the custom alert will call `delegate?.alertDidDismissWithInput(nil)` which will pass nil in the input parameter of the method and the view controller can handle this accordingly.

This way by using delegation pattern, the view controller can handle the input separately from the presentation of the custom alert.
*/
}

</syntaxhighlight>
<syntaxhighlight lang="swift">
</syntaxhighlight>

← Nächstältere Version		Version vom 11. Januar 2023, 12:35 Uhr
Zeile 1:		Zeile 1:
		+	== Links ==
		+	[[UIKit Framework]]
	== Beispiele ==		== Beispiele ==
	In diesem Beispiel sind ein paar Alerts angelegt. Es gibt im View ein Label und ein paar Buttons. Interessant ist das CustomAlert. Es ist möglich vollständig eigene Designs zu erzeugen. Am saubersten funktioniert das wenn man das Delegate Pattern nutzt.		In diesem Beispiel sind ein paar Alerts angelegt. Es gibt im View ein Label und ein paar Buttons. Interessant ist das CustomAlert. Es ist möglich vollständig eigene Designs zu erzeugen. Am saubersten funktioniert das wenn man das Delegate Pattern nutzt.

@@ Zeile 1: / Zeile 1: @@
 == Beispiele ==
 <syntaxhighlight lang="swift">
 //

UIAlertController - Versionsgeschichte

134.3.86.14 am 11. Januar 2023 um 12:35 Uhr

134.3.86.14 am 11. Januar 2023 um 12:24 Uhr

134.3.86.14: Die Seite wurde neu angelegt: „== Beispiele == // // ViewController.swift // UIAlert Demo // // Created by Stephan Schlegel on 08.01.23. // import UIKit c…“