为什么我的 iOS 应用程序不禁用深色模式？

Question

So... I've tried to set my app to disable iOS 13 dark mode by forcing light mode according apple documentation, in the emulator all attempts work fine, but when I try on the real device, nothing happens, it's like I've never changed my code

First Attempt

Override the Interface Style for a Window, View, or View Controller

I tried to put this code sample in my viewDidLoad()

Nothing Changed

if #available(iOS 13.0, *) {
   overrideUserInterfaceStyle = .light
} else {
  // Fallback on earlier versions
}

Second Attempt

Opt Out of Dark Mode Entirely

The system automatically opts in any app linked against the iOS 13.0 or later SDK to both light and dark appearances. If you need extra time to work on your app's Dark Mode support, you can temporarily opt out by including the UIUserInterfaceStyle key (with a value of Light) in your app's Info.plist file. Setting this key to Light causes the system to ignore the user's preference and always apply a light appearance to your app.

Nothing changed

Apple Documentation: Choosing a Specific Interface Style for Your iOS App

If anyone knows how I set my app only in light mode... I'll be very grateful:D

Answer 1

Simply you can add a new key UIUserInterfaceStyle in your app info.plist (Notes: Xcode 12 and above has renamed to Appearance ) and set its value to Light or Dark . this will override the app default style to the value you provide.

so you don't need to bother about having it anywhere else

Answer 2

if #available(iOS 13, *) {
    window.overrideUserInterfaceStyle = .light
}

Should work. Call it in your AppDelegate 's didFinishLaunchingWithOptions .

Answer 3

Change the window UserInterfaceStyle for iOS 13+ version. Just set

UIApplication.shared.changeStatusBarStyle(.light)

or

UIApplication.shared.changeStatusBarStyle(.dark)

after changing window every time.

extension UIApplication {

        enum StatusColor {

            case dark, light
        }

        func changeStatusBarStyle(_ mode: StatusColor = .light) {

            if #available(iOS 13.0, *) {

                guard let appDelegate = delegate as? AppDelegate else { return }

                var interfaceStyle: UIUserInterfaceStyle

                switch mode {
                case .dark:
                    interfaceStyle = .dark
                default:
                    interfaceStyle = .light
                }

                appDelegate.window?.overrideUserInterfaceStyle = interfaceStyle
            }
        }
    }

If any confusion please let me know.

Answer 4

Add inside Info.plist

<key>Appearance</key>
<string>Light</string>

Answer 5

For SwiftUI you might find the following solution helpful:

extension UIApplication {
    func changeInterfaceStyle(_ mode: UIUserInterfaceStyle = .light) {
        if #available(iOS 13.0, *) {
            var window: UIWindow? {
                guard let scene = connectedScenes.first,
                      let windowSceneDelegate = scene.delegate as? UIWindowSceneDelegate,
                      let window = windowSceneDelegate.window else {
                    return nil
                }
                return window
            }
            window?.overrideUserInterfaceStyle = mode
        }
    }
}

Usage:

    Button("Dark") {
        UIApplication.shared.changeInterfaceStyle(.dark)
    }