When using body to package multiple Reducers, the type check will not work.

[dazy1030]

hi,

I recently learned how to use bi-directional binding with BindingState, and I used body in place of the reduce method, but the type checking (completion) does not work properly. This happens even with a very simple Reducer as shown below.

struct Toggle: Reducer {
    struct State: Equatable {
        @BindingState var isToggleOn: Bool = false
    }
    
    enum Action: BindableAction, Equatable {
        case binding(BindingAction<State>)
    }
    
    var body: some Reducer<State, Action> {
        Reduce { state, aciton in
            switch aciton {
            case .binding:
                return .none
            }
        }
        BindingReducer()
    }
}

For example, let's add an action called buttonPressed to Action and add in body that it returns Effect<Toggle.Action>.none. At this point, I want to write something like return .none, but Xcode does not show the prediction. Is there a better way to do this?

[MohamedGhebaji]

Hi,
To fixe this you can add the generic State and Action to the reduce, like this Reduce<Sate, Action> { and autocompletion will work as expected.

[mbrandonw]

Yeah as @MohamedGhebaji mentioned, specifying the types will fix it. Also this compiler limitation is fixed in Swift 5.9 so once Xcode 15 is out this will be less of a concern.

[dazy1030]

Thank you @MohamedGhebaji! Indeed, autocomplete has come alive ☺️.
@mbrandonw, Swift is getting even smarter. I'm looking forward to Xcode15 more and more!