Added dependency injection example

Author: janeshsutharios

SwiftUIExamples/SwiftUIExamples.xcodeproj/project.pbxproj

@@ -16,6 +16,7 @@
 		10525C852E2D2D9F00D7C510 /* git_hub_repos_async_tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 10525C742E2D2D1A00D7C510 /* git_hub_repos_async_tests.swift */; };
 		107A5D2D2E1D4252004C4BE6 /* SchoolApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 107A5D2C2E1D4252004C4BE6 /* SchoolApp.swift */; };
 		1082B7272E26ABB800A74AA6 /* CombineExamples.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1082B7262E26ABB800A74AA6 /* CombineExamples.swift */; };
+		1089EA622E38695900B1E312 /* Dependency-Injection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1089EA612E38695900B1E312 /* Dependency-Injection.swift */; };
 		1099980E2E24DAA600A8A3C9 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1099980D2E24DAA600A8A3C9 /* main.swift */; };
 		109998132E252E7400A8A3C9 /* FlatMapVsSwitchToLatest1.swift in Sources */ = {isa = PBXBuildFile; fileRef = 109998122E252E7400A8A3C9 /* FlatMapVsSwitchToLatest1.swift */; };
 		109998152E25444C00A8A3C9 /* FlatMapVsSwitchToLatest2.swift in Sources */ = {isa = PBXBuildFile; fileRef = 109998142E25444C00A8A3C9 /* FlatMapVsSwitchToLatest2.swift */; };
@@ -62,6 +63,7 @@
 		10525C7E2E2D2D9800D7C510 /* SwiftUIExamplesTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwiftUIExamplesTests.swift; sourceTree = "<group>"; };
 		107A5D2C2E1D4252004C4BE6 /* SchoolApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SchoolApp.swift; sourceTree = "<group>"; };
 		1082B7262E26ABB800A74AA6 /* CombineExamples.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CombineExamples.swift; sourceTree = "<group>"; };
+		1089EA612E38695900B1E312 /* Dependency-Injection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Dependency-Injection.swift"; sourceTree = "<group>"; };
 		1099980B2E24DAA600A8A3C9 /* SwiftUI-CommandLineTool */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = "SwiftUI-CommandLineTool"; sourceTree = BUILT_PRODUCTS_DIR; };
 		1099980D2E24DAA600A8A3C9 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
 		109998122E252E7400A8A3C9 /* FlatMapVsSwitchToLatest1.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FlatMapVsSwitchToLatest1.swift; sourceTree = "<group>"; };
@@ -138,6 +140,14 @@
 			path = SwiftUIExamplesTests;
 			sourceTree = "<group>";
 		};
+		1089EA602E38694300B1E312 /* Archs */ = {
+			isa = PBXGroup;
+			children = (
+				1089EA612E38695900B1E312 /* Dependency-Injection.swift */,
+			);
+			path = Archs;
+			sourceTree = "<group>";
+		};
 		1099980C2E24DAA600A8A3C9 /* SwiftUI-CommandLineTool */ = {
 			isa = PBXGroup;
 			children = (
@@ -170,6 +180,7 @@
 		10AB453B2DD24B7B00967614 /* SwiftUIExamples */ = {
 			isa = PBXGroup;
 			children = (
+				1089EA602E38694300B1E312 /* Archs */,
 				10AB453C2DD24B7B00967614 /* SwiftUIExamplesApp.swift */,
 				10525C712E2D2A4A00D7C510 /* AsyncAwait */,
 				072EEEAD2E1E8CD10007B3A4 /* Combine */,
@@ -334,6 +345,7 @@
 				072EEEAF2E1E8CE40007B3A4 /* SearchViewUsingCombine.swift in Sources */,
 				072EEEC42E1E98DA0007B3A4 /* DataTaskPublisher.swift in Sources */,
 				109998132E252E7400A8A3C9 /* FlatMapVsSwitchToLatest1.swift in Sources */,
+				1089EA622E38695900B1E312 /* Dependency-Injection.swift in Sources */,
 				10AB453D2DD24B7B00967614 /* SwiftUIExamplesApp.swift in Sources */,
 				109998152E25444C00A8A3C9 /* FlatMapVsSwitchToLatest2.swift in Sources */,
 				10525C732E2D2A6000D7C510 /* UserListAsyncStaticData.swift in Sources */,

SwiftUIExamples/SwiftUIExamples/Archs/Dependency-Injection.swift

@@ -0,0 +1,72 @@
+//
+// RepoListDIApp.swift
+// Complete iOS App using MVVM with Dependency Injection
+//
+
+import SwiftUI
+
+// MARK: - View
+
+struct ProjectsListView: View {
+    @StateObject var viewModel: RepoViewModel
+
+    var body: some View {
+        NavigationView {
+            List(viewModel.repos, id: \.self) { repo in
+                Text(repo)
+            }
+            .navigationTitle("Projects")
+            .onAppear {
+                viewModel.loadRepos()
+            }
+        }
+    }
+}
+
+
+// MARK: - ViewModel
+
+class RepoViewModel: ObservableObject {
+    @Published var repos: [String] = []
+    private let service: RepoServiceProtocol
+
+    init(service: RepoServiceProtocol) {
+        self.service = service
+    }
+
+    func loadRepos() {
+        service.fetchRepos { [weak self] result in
+            DispatchQueue.main.async {
+                self?.repos = result
+            }
+        }
+    }
+}
+
+
+// MARK: - Protocol
+
+protocol RepoServiceProtocol {
+    func fetchRepos(completion: @escaping ([String]) -> Void)
+}
+
+
+// MARK: - Real Service
+
+class RepoService: RepoServiceProtocol {
+    func fetchRepos(completion: @escaping ([String]) -> Void) {
+        // Simulate API delay
+        DispatchQueue.global().asyncAfter(deadline: .now() + 1.0) {
+            completion(["Swift", "Combine", "UIKit", "CoreData"])
+        }
+    }
+}
+
+
+// MARK: - Mock Service (for unit tests or previews)
+
+class MockRepoService: RepoServiceProtocol {
+    func fetchRepos(completion: @escaping ([String]) -> Void) {
+        completion(["MockRepo1", "MockRepo2"])
+    }
+}

SwiftUIExamples/SwiftUIExamples/SwiftUIExamplesApp.swift

@@ -34,9 +34,14 @@ struct DashboardView: View {
         ExampleItem(title: "ButtonThrottle ", destination: AnyView(ButtonThrottle())),
         ExampleItem(title: "Handle events ", destination: AnyView(GitHubSearchView3())),
         ExampleItem(title: "Aync Await with Static Data protocols", destination: AnyView(UserListView(viewModel: UserListViewModel(userService: MockUserService())))),
-        ExampleItem(title: "Aync Await with  API and protocols tests", destination: AnyView(RepoListView(username: "janeshsutharios", viewModel: RepoListViewModel(service: GitHubService()))))
-
+        ExampleItem(title: "Aync Await with  API and protocols tests", destination: AnyView(RepoListView(username: "janeshsutharios", viewModel: RepoListViewModel(service: GitHubService())))),
+        ExampleItem(title: "Dependency-Injection ", destination: AnyView(ProjectsListView(viewModel: RepoViewModel(service:  RepoService())))),
     ]
+    
+    var getViewModelForDI: RepoViewModel {
+        let service = RepoService() // Swap with MockRepoService() for testing
+        return RepoViewModel(service: service)
+    }
 
     var body: some View {
         NavigationView {