No such module 'UIKit'

Question

All I want to do is make the most basic macOS / OS X app that just shows a WKWebView...

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {

var webView: WKWebView!

override func loadView() {
    let webConfiguration = WKWebViewConfiguration()
    webView = WKWebView(frame: .zero, configuration: webConfiguration)
    webView.uiDelegate = self
    view = webView
}
override func viewDidLoad() {
    super.viewDidLoad()
    
    let myURL = URL(string: "https://www.apple.com")
    let myRequest = URLRequest(url: myURL!)
    webView.load(myRequest)
}}

But this shows the error:

No such module 'UIKit'

Gardening

Answer 1

UIKit is for mobile apps, not MacOS apps. You want AppKit.

Danicadanice

Okay. So how do I create a simple WKWebView for my mac app... not for iOS. The code above is clearly for iOS I guess. – Gardening

Delete the import UIKit and import AppKit & Cocoa. – Danicadanice

Now I have 6 errors... including "Use of undeclared type 'UIViewController'" – Gardening

UIViewController is part of UIKit. You can't use any UIKit class. In this case UIViewController's counterpart in AppKit is NSViewController – Contemptuous

I have a mobile app. I'm getting this for a pod. – Neritic

Answer 2

• First of all your detail shows that you are working on MacOS app, but your Tittle is about UIKit.
• APPKit MacOS development and UIKit is for iOS/TabOS.

1. UIKit cannot be import for MacOS playground environment. Use AppKit
2. If you are developing for iOS mobile environment and still face issue importing UIKit then you can follow following steps:

If you already selected iOS while creating Playground file but still getting error No such module 'UIKit', then follow following steps. Xcode 13

enter image description here

Bitterroot

The question is about building a macOS app, not an iOS app. The error is caused by trying to import UIKit instead of AppKit. – Hebraism

Answer 3

• Open utilities from the top right corner
• Change the platform to IOS

Then it should be okay to use UIKit

Hollow

A helpful screenshot in https://mcmap.net/q/141901/-xcode-playground-gets-stuck-on-39-running-playground-39-or-39-launching-simulator-39-and-won-39-t-run-the-code-what-to-do illustrates how to change the platform. Make sure Inspectors (the right-hand sidebar) is open. – Neomineomycin

The question is about building a macOS app, not an iOS app. The error is caused by trying to import UIKit instead of AppKit. – Hebraism

Answer 4

Check the 'show utilities' window. If the platform is set to MacOS, you'll get this error if you're calling UIKit. Same thing goes if your wanting IoS and your calling AppKit.

http://iosbrain.com/blog/2018/08/16/xcode-9-playground-error-no-such-module-uikit-or-appkit/

Kangaroo

Answer 5

Check what device you are using. If you are using macOS instead of an iPhone 14, you will get this fault when you import UIKit. You do not have to reinstall Xcode.

Suzetta

This duplicates essentially every other answer and adds no new content. Please don't post an answer unless you actually have something new to contribute. You can show your support for an answer by upvoting. – Todo

My software does not show the dialog screen like the one in the screenshot. So I posted to how I made it work with my version. Or it is available but I could not find it. Sorry this year one for me. – Suzetta