How do I inject mock services for previews in SwiftUI with Swift?

In SwiftUI, you can easily inject mock services for previews to test your views without requiring actual implementations. This is especially useful for unit testing and ensuring your views perform as expected with various input data scenarios. Below is an example of how to create a mock service and utilize it within SwiftUI previews.


        // Define a protocol for the service
        protocol DataService {
            func fetchData() -> String
        }

        // Create a real implementation of the service
        class RealDataService: DataService {
            func fetchData() -> String {
                return "Real Data"
            }
        }

        // Create a mock implementation of the service
        class MockDataService: DataService {
            func fetchData() -> String {
                return "Mock Data"
            }
        }

        // Your SwiftUI view that uses the DataService
        struct ContentView: View {
            var dataService: DataService

            var body: some View {
                Text(dataService.fetchData())
            }
        }

        // SwiftUI Preview
        struct ContentView_Previews: PreviewProvider {
            static var previews: some View {
                ContentView(dataService: MockDataService()) // Injecting mock service
            }
        }

How do I inject mock services for previews in SwiftUI with Swift?

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How do I inject mock services for previews in SwiftUI with Swift?

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