Chapter 3 final code

Landmarks/HandlingUserInput.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		8473A7282530857400415A81 /* UserData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8473A7272530857400415A81 /* UserData.swift */; };
 		B7394866229F194000C47603 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = B7394865229F194000C47603 /* AppDelegate.swift */; };
 		B7394868229F194000C47603 /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = B7394867229F194000C47603 /* SceneDelegate.swift */; };
 		B739486A229F194000C47603 /* LandmarkDetail.swift in Sources */ = {isa = PBXBuildFile; fileRef = B7394869229F194000C47603 /* LandmarkDetail.swift */; };
@@ -35,8 +36,9 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
-		6AF17FBC250C47AD4B5BC2FB /* SampleCode.xcconfig */ = {isa = PBXFileReference; name = SampleCode.xcconfig; path = ../Configuration/SampleCode.xcconfig; sourceTree = "<group>"; };
-		8016A7122042026B58FF1299 /* LICENSE.txt */ = {isa = PBXFileReference; includeInIndex = 1; path = LICENSE.txt; sourceTree = "<group>"; };
+		6AF17FBC250C47AD4B5BC2FB /* SampleCode.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = SampleCode.xcconfig; path = ../Configuration/SampleCode.xcconfig; sourceTree = "<group>"; };
+		8016A7122042026B58FF1299 /* LICENSE.txt */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text; path = LICENSE.txt; sourceTree = "<group>"; };
+		8473A7272530857400415A81 /* UserData.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserData.swift; sourceTree = "<group>"; };
 		B7394862229F194000C47603 /* Landmarks.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Landmarks.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		B7394865229F194000C47603 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		B7394867229F194000C47603 /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
@@ -113,6 +115,7 @@
 				B7394867229F194000C47603 /* SceneDelegate.swift */,
 				B73948A0229F2E1F00C47603 /* LandmarkList.swift */,
 				B739489E229F2D9700C47603 /* LandmarkRow.swift */,
+				8473A7272530857400415A81 /* UserData.swift */,
 				B7394869229F194000C47603 /* LandmarkDetail.swift */,
 				B739487D229F1C0100C47603 /* Supporting Views */,
 				B7394883229F291A00C47603 /* Resources */,
@@ -271,6 +274,7 @@
 				B7394868229F194000C47603 /* SceneDelegate.swift in Sources */,
 				B739486A229F194000C47603 /* LandmarkDetail.swift in Sources */,
 				B739489F229F2D9700C47603 /* LandmarkRow.swift in Sources */,
+				8473A7282530857400415A81 /* UserData.swift in Sources */,
 				B7394881229F28B900C47603 /* Landmark.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

Landmarks/Landmarks/LandmarkDetail.swift

@@ -8,8 +8,13 @@ A view showing the details for a landmark.
 import SwiftUI
 
 struct LandmarkDetail: View {
+    @EnvironmentObject var userData: UserData
     var landmark: Landmark
 
+    var landmarkIndex: Int {
+        userData.landmarks.firstIndex(where: { $0.id == landmark.id })!
+    }
+
     var body: some View {
         VStack {
             MapView(coordinate: landmark.locationCoordinate)
@@ -21,8 +26,22 @@ struct LandmarkDetail: View {
                 .padding(.bottom, -130)
 
             VStack(alignment: .leading) {
-                Text(landmark.name)
-                    .font(.title)
+                HStack{
+                    Text(landmark.name)
+                        .font(.title)
+                    
+                    Button(action: {
+                        self.userData.landmarks[self.landmarkIndex].isFavorite.toggle()
+                    }) {
+                        if self.userData.landmarks[self.landmarkIndex].isFavorite {
+                            Image(systemName: "star.fill")
+                                .foregroundColor(Color.yellow)
+                        } else {
+                            Image(systemName: "star")
+                                .foregroundColor(Color.gray)
+                        }
+                    }
+                }
 
                 HStack(alignment: .top) {
                     Text(landmark.park)

Landmarks/Landmarks/LandmarkList.swift

@@ -8,11 +8,20 @@ A view showing a list of landmarks.
 import SwiftUI
 
 struct LandmarkList: View {
+    @EnvironmentObject var userData: UserData
+    
     var body: some View {
         NavigationView {
-            List(landmarkData) { landmark in
-                NavigationLink(destination: LandmarkDetail(landmark: landmark)) {
-                    LandmarkRow(landmark: landmark)
+            List{
+                Toggle(isOn: $userData.showFavoritesOnly) {
+                    Text("Favorites Only")
+                }
+                ForEach(userData.landmarks) { landmark in
+                    if !self.userData.showFavoritesOnly || landmark.isFavorite {
+                            NavigationLink(destination: LandmarkDetail(landmark: landmark)) {
+                            LandmarkRow(landmark: landmark)
+                        }
+                    }
                 }
             }
             .navigationBarTitle(Text("Landmarks"))

Landmarks/Landmarks/SceneDelegate.swift

@@ -20,7 +20,10 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         // Use a UIHostingController as window root view controller
         if let windowScene = scene as? UIWindowScene {
             let window = UIWindow(windowScene: windowScene)
-            window.rootViewController = UIHostingController(rootView: LandmarkList())
+            window.rootViewController = UIHostingController(
+                rootView: LandmarkList()
+                    .environmentObject(UserData())
+            )
             self.window = window
             window.makeKeyAndVisible()
         }

Landmarks/Landmarks/Supporting Views/LandmarkRow.swift

@@ -17,6 +17,12 @@ struct LandmarkRow: View {
                 .frame(width: 50, height: 50)
             Text(landmark.name)
             Spacer()
+            
+            if landmark.isFavorite{
+                Image(systemName: "star.fill")
+                    .imageScale(/*@START_MENU_TOKEN@*/.medium/*@END_MENU_TOKEN@*/)
+                    .foregroundColor(.yellow)
+            }
         }
     }
 }

Landmarks/Landmarks/UserData.swift

@@ -0,0 +1,15 @@
+//
+//  UserData.swift
+//  Landmarks
+//
+//  Created by Admin on 09.10.2020.
+//  Copyright © 2020 Apple. All rights reserved.
+//
+
+import SwiftUI
+import Combine
+
+final class UserData: ObservableObject{
+    @Published var showFavoritesOnly = false
+    @Published var landmarks = landmarkData
+}