ivkuznetsov / Coordinators

Implementation of Coordinator pattern in Swift UI

Coordinators

Implementation of Coordinator pattern in Swift UI

Example of implementation:

final class SomeCoordinator: NavigationModalCoordinator {
    enum Screen: ScreenProtocol {
        case screen1
        case screen2
        case screen3
    }
    
    func destination(for screen: Screen) -> some View {
        switch screen {
            case .screen1: Screen1View()
            case .screen2: Screen2View()
            case .screen3: Screen3View()
        }
    }
    
    enum ModalFlow: ModalProtocol {
        case modalScreen1
        case modalFlow(ChildCoordinator = .init())
    }
    
    func destination(for flow: ModalFlow) -> some View {
        switch flow {
            case .modalScreen1: Modal1View()
            case .modalFlow(let coordinator): coordinator.view(for: .rootScreen)
        }
    }
}

SomeCoordinator contains a navigation controller that can push one of the 3 views defined by Screen enum. Also it can present a modal view and a modal navigation flow with child navigation specified by ChildCoordinator.

Show view in SwiftUI hierarchy, with screen1 as root view:

coordinator.view(for: .screen1)

Push view in navigation stack:

coordinator.present(.screen1)

Present modal view:

coordinator.present(.modalFlow())

Current coordinator passed to child views as environment object:

@EnvironmentObject var coordinator: SomeCoordinator

Meta

Ilya Kuznetsov – [e-mail]

Distributed under the MIT license. See LICENSE for more information.

https://github.com/ivkuznetsov