Implement dark mode switch in SwiftUI App

by

Single View

To change the color scheme of a single view (Could be the main ContentView of the app), you can use the following modifier:

.environment(\.colorScheme, .light) // or .dark

or

.preferredColorScheme(.dark)

Also, you can apply it to the ContentView to make your entire app dark!

Assuming you didn’t change the ContentView name in scene delegate or @main

Entire App (Including the UIKit parts and The SwiftUI)

First you need to access the window to change the app colorScheme that called UserInterfaceStyle in UIKit.

I used this in SceneDelegate:

private(set) static var shared: SceneDelegate?

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    Self.shared = self
    ...
}

Then you need to bind an action to the toggle. So you need a model for it.

struct ToggleModel {
    var isDark: Bool = true {
        didSet { 
            SceneDelegate.shared?.window!.overrideUserInterfaceStyle = isDark ? .dark : .light 
        }
    }
}

At last, you just need to toggle the switch:

struct ContentView: View {
     @State var model = ToggleModel()

     var body: some View {
         Toggle(isOn: $model.isDark) {
             Text("is Dark")
        }
    }
}

From the UIKit part of the app

Each UIView has access to the window, So you can use it to set the . overrideUserInterfaceStyle value to any scheme you need.

myView.window?.overrideUserInterfaceStyle = .dark

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