Adding Observables class

DHBW-Service.xcodeproj/project.pbxproj

@@ -16,6 +16,7 @@
 		CD9FAB98258EC60600D6D0C5 /* DHBW_ServiceTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD9FAB97258EC60600D6D0C5 /* DHBW_ServiceTests.swift */; };
 		CD9FABA3258EC60600D6D0C5 /* DHBW_ServiceUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD9FABA2258EC60600D6D0C5 /* DHBW_ServiceUITests.swift */; };
 		CDCD721A25912E1200FBF2F5 /* HomeView.swift in Sources */ = {isa = PBXBuildFile; fileRef = CDCD721925912E1200FBF2F5 /* HomeView.swift */; };
+		CDCD72242591316500FBF2F5 /* LocalSettings.swift in Sources */ = {isa = PBXBuildFile; fileRef = CDCD72232591316500FBF2F5 /* LocalSettings.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -51,6 +52,7 @@
 		CD9FABA2258EC60600D6D0C5 /* DHBW_ServiceUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DHBW_ServiceUITests.swift; sourceTree = "<group>"; };
 		CD9FABA4258EC60600D6D0C5 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		CDCD721925912E1200FBF2F5 /* HomeView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeView.swift; sourceTree = "<group>"; };
+		CDCD72232591316500FBF2F5 /* LocalSettings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalSettings.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -103,6 +105,7 @@
 			children = (
 				CDCD720F25912D3C00FBF2F5 /* App */,
 				CDCD721025912D4900FBF2F5 /* Views */,
+				CDCD72222591314000FBF2F5 /* Observables */,
 				CDCD721125912D5400FBF2F5 /* CoreData */,
 				CDCD721225912D6300FBF2F5 /* Supporting Files */,
 				CD9FAB86258EC60600D6D0C5 /* Preview Content */,
@@ -179,6 +182,14 @@
 			path = Tabs;
 			sourceTree = "<group>";
 		};
+		CDCD72222591314000FBF2F5 /* Observables */ = {
+			isa = PBXGroup;
+			children = (
+				CDCD72232591316500FBF2F5 /* LocalSettings.swift */,
+			);
+			path = Observables;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -310,6 +321,7 @@
 			files = (
 				CD9FAB8A258EC60600D6D0C5 /* Persistence.swift in Sources */,
 				CD9FAB83258EC60200D6D0C5 /* ContentView.swift in Sources */,
+				CDCD72242591316500FBF2F5 /* LocalSettings.swift in Sources */,
 				CD9FAB8D258EC60600D6D0C5 /* DHBW_Service.xcdatamodeld in Sources */,
 				CDCD721A25912E1200FBF2F5 /* HomeView.swift in Sources */,
 				CD9FAB81258EC60200D6D0C5 /* DHBW_ServiceApp.swift in Sources */,

DHBW-Service/App/DHBW_ServiceApp.swift

@@ -10,11 +10,13 @@ import SwiftUI
 @main
 struct DHBW_ServiceApp: App {
     let persistenceController = PersistenceController.shared
+    let settings = LocalSettings()
 
     var body: some Scene {
         WindowGroup {
             ContentView()
                 .environment(\.managedObjectContext, persistenceController.context)
+                .environmentObject(settings)
         }
     }
 }

DHBW-Service/Observables/LocalSettings.swift

@@ -0,0 +1,25 @@
+//
+//  LocalSettings.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 21.12.20.
+//
+
+import Foundation
+import Combine
+
+private var cancellables = [String:AnyCancellable]()
+
+extension Published {
+    init(wrappedValue defaultValue: Value, key: String) {
+        let value = UserDefaults.standard.object(forKey: key) as? Value ?? defaultValue
+        self.init(initialValue: value)
+        cancellables[key] = projectedValue.sink { val in
+            UserDefaults.standard.set(val, forKey: key)
+        }
+    }
+}
+
+class LocalSettings: ObservableObject {
+    @Published(wrappedValue: true, key: "IsFirstOpening") var isFirstOpening: Bool // To determine if the user is logged in
+}

DHBW-Service/Views/ContentView.swift

@@ -9,9 +9,12 @@ import SwiftUI
 import CoreData
 
 struct ContentView: View {
+    @EnvironmentObject var settings: LocalSettings
     @State private var selection = 0
     
     var body: some View {
+        Group {
+            if(!settings.isFirstOpening) {
                 TabView(selection: $selection) {
                     HomeView()
                         .tabItem {
@@ -22,8 +25,19 @@ struct ContentView: View {
                         }
                         .tag(0)
                 }
+            } else {
+                Button(action: {
+                    self.settings.isFirstOpening = !self.settings.isFirstOpening
+                }){
+                    Text("First opening toggle")
                 }
             }
+        }
+    }
+}
+
+extension ContentView{
+}
 
 struct ContentView_Previews: PreviewProvider {
     static var previews: some View {

DHBW-Service/Views/Tabs/HomeView.swift

@@ -8,13 +8,23 @@
 import SwiftUI
 
 struct HomeView: View {
+    @EnvironmentObject var settings: LocalSettings
+    
     var body: some View {
-        Text(/*@START_MENU_TOKEN@*/"Hello, World!"/*@END_MENU_TOKEN@*/)
+        VStack {
+            Button(action: {
+                self.settings.isFirstOpening = !self.settings.isFirstOpening
+            }){
+                Text("First opening toggle")
+            }
+            Text("Test")
+        }
     }
 }
 
 struct HomeView_Previews: PreviewProvider {
     static var previews: some View {
         HomeView()
+            .preferredColorScheme(.dark)
     }
 }