Implement dark mode switch in SwiftUI App

Question

I\'m currently looking into Dark Mode in my App. While Dark Mode itself isn\'t much of a struggle because of my SwiftUI basis i\'m struggling with the option to set the Colo

Answer 1

A demo of using @AppStorage to switch dark mode

PS: For global switch, modifier should be added to WindowGroup/MainContentView

import SwiftUI

struct SystemColor: Hashable {
    var text: String
    var color: Color
}

let backgroundColors: [SystemColor] = [.init(text: "Red", color: .systemRed), .init(text: "Orange", color: .systemOrange), .init(text: "Yellow", color: .systemYellow), .init(text: "Green", color: .systemGreen), .init(text: "Teal", color: .systemTeal), .init(text: "Blue", color: .systemBlue), .init(text: "Indigo", color: .systemIndigo), .init(text: "Purple", color: .systemPurple), .init(text: "Pink", color: .systemPink), .init(text: "Gray", color: .systemGray), .init(text: "Gray2", color: .systemGray2), .init(text: "Gray3", color: .systemGray3), .init(text: "Gray4", color: .systemGray4), .init(text: "Gray5", color: .systemGray5), .init(text: "Gray6", color: .systemGray6)]

struct DarkModeColorView: View {

    @AppStorage("isDarkMode") var isDarkMode: Bool = true

    var body: some View {
        Form {
            Section(header: Text("Common Colors")) {
                ForEach(backgroundColors, id: \.self) {
                    ColorRow(color: $0)
                }
            }
        }
        .toolbar {
            ToolbarItem(placement: .principal) { // navigation bar
               Picker("Color", selection: $isDarkMode) {
                    Text("Light").tag(false)
                    Text("Dark").tag(true)
                }
                .pickerStyle(SegmentedPickerStyle())
            }
        }
        .modifier(DarkModeViewModifier())
    }
}

private struct ColorRow: View {

    let color: SystemColor

    var body: some View {
        HStack {
            Text(color.text)
            Spacer()
            Rectangle()
                .foregroundColor(color.color)
                .frame(width: 30, height: 30)
        }
    }
}

public struct DarkModeViewModifier: ViewModifier {

    @AppStorage("isDarkMode") var isDarkMode: Bool = true

    public func body(content: Content) -> some View {
        content
            .environment(\.colorScheme, isDarkMode ? .dark : .light)
            .preferredColorScheme(isDarkMode ? .dark : .light) // tint on status bar
    }
}

struct DarkModeColorView_Previews: PreviewProvider {
    static var previews: some View {
        NavigationView {
            DarkModeColorView()
        }
    }
}