SwiftDI

SwiftDI it’s a tool for Dependency Injection using @propertyWrapper. Right now SwiftDI is alpha version. Be careful!

SwiftDI works with Swift 5.1 only and SwiftUI.

Please looks at our demo SwiftDIDemo!

How it use?

1. Create your container:

let container = DIContainer()

2. Create your assemblies extended from DIPart:

class MyAssembly: DIPart {
    var body: some DIPart {
        // Some Assembly parts place here
    }
}

3. Register your objects:

class MyAssembly: DIPart {
    var body: some DIPart {
        DIRegister(MyService.init)
    }
}

you can use as<T>(_ type: T.Type) for set a new injection identifier:

class MyAssembly: DIPart {
    var body: some DIPart {
        DIRegister(MyService.init)
            .as (MyServiceInput.self)
    }
}

4. Load your DIPart to the container:

let container = DIContainer(part: MyAssembly())

or

let container = DIContainer()
container.appendPart(MyAssembly())

5. Set your container to SwiftDI:

SwiftDI.useContainer(container)

6. Use your DI

class MyController: UIViewController {
    @Injected var service: MyServiceInput
}

Does it! You’re finish setup your DI container.

DSL

1. DIGroup - Contains one or many DIParts

DIGroup {
    // Place you DIParts here
}

2. DIRegister - Register some object

   DIRegister(MyService.init)

also contains methods lifeCycle() and as()

SwiftDI ❤️ SwiftUI!

SwiftDI also supports SwiftUI framework. You can inject your BindableObject and property automatically connect to view state. For this magic just use @EnvironmentObservedInject

struct ContentView: View {
    
    @EnvironmentObservedInject var viewModel: ContentViewModel

    var body: some View {
        HStack {
            Text(viewModel.title)
        }.onAppear { self.viewModel.getData() }
    }
}

For non-mutating view object use @EnvironmentInject:

struct ContentView: View {
    
    @EnvironmentInject var authService: AuthorizationService

    var body: some View {
        HStack {
            Text("Waiting...")
        }.onAppear { self.authService.auth() }
    }
}

By default SwiftDI using shared container, but if you wanna pass custom container to view using method inject(container:) for view:

let container = DIContainer()

let view = HomeView().inject(container: container)

Or if you wanna add some method to container using method environmentInject:

// SceneDelegate.swift

let window = UIWindow(windowScene: windowScene)
let authService = AuthorizationService(window: window)

let view = HomeView().environmentInject(authService)

// etc

Scopes

SwiftDI supports object scopes, you can use method lifeCycle

DIRegister(MyService.init)
    .lifeCycle(.single)

By default life time for instance is objectGraph. objectGraph using Mirror for get info about nested injectables property and it can be slowly.

How it works?

SwiftDI using @propertyWrapper to use power of injection. @Inject it’s struct uses SwiftDI.sharedContainer for resolve objects when value is call.