How do I add unified theming support in Combine with Swift?

Unified theming support in Combine with Swift can greatly enhance the user experience by providing a consistent design throughout your application. By leveraging Combine's reactive programming paradigm, you can create dynamic and responsive UI components that adapt to theme changes seamlessly. Below is an example of how to implement unified theming support using Combine.

// Example of unified theming support in Swift import SwiftUI import Combine // Define a Theme struct struct Theme { var backgroundColor: Color var textColor: Color } // Create a ThemeManager to handle theme changes class ThemeManager: ObservableObject { @Published var currentTheme: Theme init(defaultTheme: Theme) { self.currentTheme = defaultTheme } func changeTheme(to newTheme: Theme) { currentTheme = newTheme } } struct ContentView: View { @EnvironmentObject var themeManager: ThemeManager var body: some View { VStack { Text("Hello, World!") .foregroundColor(themeManager.currentTheme.textColor) .padding() .background(themeManager.currentTheme.backgroundColor) Button(action: { themeManager.changeTheme(to: Theme(backgroundColor: .black, textColor: .white)) }) { Text("Switch to Dark Theme") } } .padding() } } @main struct MyApp: App { let themeManager = ThemeManager(defaultTheme: Theme(backgroundColor: .white, textColor: .black)) var body: some Scene { WindowGroup { ContentView() .environmentObject(themeManager) } } }

unified theming Combine Swift reactive programming SwiftUI