声明 'subscribe' 不能覆盖多个超类声明 (ReSwift)

Question

我在覆盖 ReSwift Pod 中的函数时遇到问题。我有以下模拟 class:

import Foundation
import Quick
import Nimble
import RxSwift
@testable import MainProject
@testable import ReSwift

    class MockReSwiftStore: ReSwift.Store<MainState> {
    var dispatchDidRun: Bool = false
    var subscribeWasTriggered: Bool = false

    init() {
        let reducer: Reducer<MainState> = {_, _  in MainState() }
        super.init(reducer: reducer, state: nil)
    }

    required init(
        reducer: @escaping (Action, State?) -> State,
        state: State?,
        middleware: [(@escaping DispatchFunction, @escaping () -> State?) -> (@escaping DispatchFunction) -> DispatchFunction]) {
        super.init(reducer: reducer, state: state, middleware: middleware)
    }

    override func subscribe<SelectedState, S>(
        _ subscriber: S,
        transform: ((Subscription<MainState>) -> Subscription<SelectedState>)?)
        where S: StoreSubscriber,

        S.StoreSubscriberStateType == SelectedState {
            subscribeWasTriggered = true
        }
    }
}

并且在重写订阅方法时出现以下错误

然后当使用自动完成时它也显示 2 次出现：

然而，当寻找原始函数时，只有一个看起来像这样的函数

open func subscribe<SelectedState, S: StoreSubscriber>(
    _ subscriber: S, transform: ((Subscription<State>) -> Subscription<SelectedState>)?
) where S.StoreSubscriberStateType == SelectedState
{
    // Create a subscription for the new subscriber.
    let originalSubscription = Subscription<State>()
    // Call the optional transformation closure. This allows callers to modify
    // the subscription, e.g. in order to subselect parts of the store's state.
    let transformedSubscription = transform?(originalSubscription)

    _subscribe(subscriber, originalSubscription: originalSubscription,
               transformedSubscription: transformedSubscription)
}

这是我的编译器输出

我没有想法所以非常感谢任何帮助谢谢！

Answer 1

这是您的问题：

class Some<T> {

    func echo() {
        print("A")
    }

}

extension Some where T: Equatable {

    func echo() {
        print("B")
    }

}


class AnotherSome: Some<String> {

    override func echo() {
        print("Doesn't compile")
    }

}

问题是：ReSwift 开发人员将 Store.subscribe 行为声明为接口的一部分和扩展的一部分（我不确定他们为什么选择这样做而不是引入其他对象). Swift 无法确定您要覆盖的部分，因此无法编译。 Afaik 没有语言工具可以让您解决这个问题。

一个可能的解决方案是将 MockStore 实现为 StoreType 并使用 Store 对象来实现 StoreType 接口的行为。

声明 'subscribe' 不能覆盖多个超类声明 (ReSwift)

Declaration 'subscribe' cannot override more than one superclass declaration (ReSwift)

ios

swift

reswift