Swift showing use of Unresolved Identifier 'UIAlertController'

Question

import Cocoa

class ViewController: NSViewController {

    @IBOutlet weak var helloButton: NSButton!
    @IBAction func showAlert(sender: AnyObject) {

        var alert = UIAlertController(title: "Hello!", message: "Hello, world!",
        preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert, animated: true, completion: nil)
        self.helloButton.setTitle("Clicked", forState: UIControlState.Normal)
    }

yes, on OS X there is no UIKit :P – Daij-Djan Aug 15 '15 at 11:40 — Daij-Djan, Aug 15 '15 at 11:40

score 12 · Accepted Answer · edited May 23 '17 at 10:30

12

UIAlertController is an iOS class, contained in UIKit. But as you're doing a Mac app extending NSViewController and not importing UIKit (instead Cocoa), this class is not available to you.

So if you want to create an alert in your Mac app, see for example How to make an alert controller in mac using swift

edited May 23 '17 at 10:30

Community

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answered Aug 15 '15 at 11:11

Florian Pfisterer

1,205
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The linked solution is wrong. It is suggesting to use UIAlertController, which doesn't exist in Mac. – Houman Jun 10 '21 at 07:50

score 2 · Answer 2 · answered Jun 17 '18 at 15:43

2

On mac OS you use NSAlert instead of UIAlertController. A nice example of using NSAlert is given in this SO answer.

answered Jun 17 '18 at 15:43

CodeBrew

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score 0 · Answer 3 · answered Dec 05 '19 at 06:11

0

In my case was removing import Foundation or moving import UIKit above Foundation.

import UIKit
import Foundation //Remove if needed

answered Dec 05 '19 at 06:11

Marlhex

1,870
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Swift showing use of Unresolved Identifier 'UIAlertController'

3 Answers3