54 lines
1.5 KiB
Swift
54 lines
1.5 KiB
Swift
import SwiftUI
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// Enum to represent the three theme options
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enum Theme: String, CaseIterable {
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case system = "System"
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case light = "Light"
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case dark = "Dark"
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var colorScheme: ColorScheme? {
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switch self {
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case .system:
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return nil
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case .light:
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return .light
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case .dark:
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return .dark
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}
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}
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}
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// Observable class to manage the theme state
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class ThemeManager: ObservableObject {
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@AppStorage("selectedTheme") private var selectedThemeValue: String = Theme.system.rawValue
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@Published var theme: Theme
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init() {
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// Read directly from UserDefaults to avoid using self before initialization is complete.
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let storedThemeValue = UserDefaults.standard.string(forKey: "selectedTheme") ?? ""
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self.theme = Theme(rawValue: storedThemeValue) ?? .system
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}
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func setTheme(_ theme: Theme) {
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self.theme = theme
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selectedThemeValue = theme.rawValue
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}
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// This will be called from the button
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func toggleTheme(from currentSystemScheme: ColorScheme) {
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let newTheme: Theme
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switch theme {
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case .system:
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// If system is active, toggle to the opposite of the current system theme
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newTheme = currentSystemScheme == .dark ? .light : .dark
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case .light:
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newTheme = .dark
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case .dark:
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newTheme = .light
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}
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setTheme(newTheme)
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}
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}
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