ModeChanger

ModeChanger is a small SwiftUI sample app that demonstrates how to let a user choose the app's appearance mode and persist that choice across launches.

The app supports three appearance options:

• System
• Light
• Dark

The selected mode is stored with @AppStorage and applied at the app entry point with preferredColorScheme.

Requirements

• Xcode 26.4 or later
• iOS 26.4 or later

Getting Started

1. Open ModeChanger.xcodeproj in Xcode.
2. Select an iOS simulator or device.
3. Build and run the ModeChanger scheme.

Project Structure

• ModeChangerApp.swift - App entry point that applies the saved appearance mode.
• ContentView.swift - Main screen with navigation, modal presentation, and the appearance picker.
• AppearanceMode.swift - Enum that defines the supported appearance modes, labels, icons, and color schemes.
• NavigationStackView.swift - Example pushed view.
• ModalSheetView.swift - Example modal sheet.

Notes

The appearance menu is shown in the bottom toolbar. Selecting a mode updates the app immediately and saves the preference for the next launch.