我们以暗黑模式的适配来实践EnvironmentObject
暗黑模式适配
定义AppSetting,设置 @Published var darkModeSettings
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| class AppSetting: ObservableObject {
@Published var darkModeSettings: Int = UserDefaults.standard.integer(forKey: "darkMode") {
didSet {
UserDefaults.standard.set(self.darkModeSettings, forKey: "darkMode")
let scenes = UIApplication.shared.connectedScenes
let windowScene = scenes.first as? UIWindowScene
let window = windowScene?.windows.first
switch self.darkModeSettings {
case 0:
window?.overrideUserInterfaceStyle = .unspecified
case 1:
window?.overrideUserInterfaceStyle = .light
case 2:
window?.overrideUserInterfaceStyle = .dark
default:
window?.overrideUserInterfaceStyle = .unspecified
}
}
}
}
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传入 .environmentObject(AppSetting())
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| @main
struct tableViewApp: App {
var body: some Scene {
WindowGroup {
ContentView().environmentObject(AppSetting())
}
}
}
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使用@EnvironmentObject
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|
struct SettingsView: View {
@EnvironmentObject var appSettings: AppSetting
var body: some View {
NavigationStack {
List {
Section {
HStack{
Button {
appSettings.darkModeSettings = 0
} label: {
Text("跟随系统").foregroundColor(.primary)
}
Spacer()
if(appSettings.darkModeSettings == 0){
Image(systemName: "checkmark")
}
}
HStack{
Button {
appSettings.darkModeSettings = 1
} label: {
Text("白").foregroundColor(.primary)
}
Spacer()
if(appSettings.darkModeSettings == 1){
Image(systemName: "checkmark")
}
}
HStack{
Button {
appSettings.darkModeSettings = 2
} label: {
Text("暗黑").foregroundColor(.primary)
}
Spacer()
if(appSettings.darkModeSettings == 2){
Image(systemName: "checkmark")
}
}
} header: {
Text("主题设置")
.textCase(nil)
}
}
.listStyle(.insetGrouped)
.navigationTitle("设置")
}
}
}
|
相关链接阅读
SwiftUI: 全局状态管理