SwiftUI TCA Basic

TCA Map

Add swift composable architecture

https://github.com/pointfreeco/swift-composable-architecture"

実装 - import

import ComposableArchitecture

実装 - code

struct State: Equatable {
    var counter = 0
} 

enum Action: Equatable {
    case increaseCounter
    case decreaseCounter
}

struct Enviroment {

}

let reducer = Reducer< State, Action, Enviroment> { state, action, enviroment in
    switch action {
    case .increaseCounter:
        state.counter += 1
        return Effect.none
    case .decreaseCounter:
        state.counter -= 1
        return Effect.none
    }
}

struct ContentView: View {
    let store: Store<State, Action>

    var body: some View {
        WithViewStore(self.store) { viewStore in
            HStack {
                Button {
                    viewStore.send(.decreaseCounter)
                } label: {
                    Text("-")
                        .padding(8)
                        .background(.red)
                        .foregoundColor(.white)
                        .cornerRadius(8)
                }
                .buttonStyle(.plain)

                Text(viewStore.counter.description)
                    .padding(10)

                Button {
                    viewStore.send(.increaseCounter)
                } label: {
                    Text("+")
                        .padding(8)
                        .background(.red)
                        .foregoundColor(.white)
                        .cornerRadius(8)
                }
            }
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView(
            store: Store(
                initialState: State(),
                reducer: reducer,
                enviroment: Enviroment()
            )
        )
    }
}