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

Injecting mock services for previews in UIKit using Swift can greatly enhance the development and testing process of your user interfaces. By utilizing dependency injection, you can create more flexible and maintainable code in your app. Below is an example of how to implement this in your Swift UIKit projects.


        // Example code to inject mock services for previews
        import UIKit

        protocol MyServiceProtocol {
            func fetchData() -> String
        }

        class RealService: MyServiceProtocol {
            func fetchData() -> String {
                return "Real Data"
            }
        }

        class MockService: MyServiceProtocol {
            func fetchData() -> String {
                return "Mock Data for Preview"
            }
        }

        class MyViewController: UIViewController {
            var service: MyServiceProtocol!

            override func viewDidLoad() {
                super.viewDidLoad()
                let data = service.fetchData()
                print(data)
            }
        }

        // Preview setup
        struct MyViewController_Previews: PreviewProvider {
            static var previews: some View {
                let mockService = MockService()
                let viewController = MyViewController()
                viewController.service = mockService
                return viewController
            }
        }

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

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

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