UIAlertController.md

UIAlertController

Basics

import UIKit

class ViewController: UIViewController {
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        showAlert()
    }

    func showAlert() {
        let alert = UIAlertController(title: "Notifications Disabled",
                                      message: "For the best chat experience needs notification",
                                      preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        alert.addAction(UIAlertAction(title: "Settings", style: .cancel, handler: nil))

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

How to programmatically dismiss

if let _ = presentedViewController as? UIAlertController {
    dismiss(animated: true, completion: nil)
}

Number of buttons

• One or two buttons will be placed side-by-side.

• Three buttons or more it will want to stack.

Links that help

• Apple docs
• Human Interface Guidelines