可组合架构扩展

Point-Free swift-composable-architecture 的一个配套库。

TaskResult+VoidSuccess
安装

TaskResult 和 VoidSuccess

在当前的 TCA 中，TaskResult 不符合 Equatable 协议，所以必须这样写：

public struct HogeFeature: Reducer {
  public struct State: Equatable {}
  public enum Action: Equatable {
    case onAppear
    case response(TaskResult<EquatableVoid>)
  }

  public func reduce(into state: inout State, action: Action) -> Effect<Action> {
    switch action {
    case .onAppear:
      return .run { send in
        await send(
          .response(
            TaskResult {
              try await asyncThrowsVoidFunc()
              return VoidSuccess()
            }
          )
        )
      }
    case .response(.success):
      // do something
      return .none

    case .response(.failure(let error)):
      // handle error
      return .none
    }
  }
}

即使 Swift 中已经提供了 Void，为了让 TaskResult 遵循 Equatable 协议而专门创建 VoidSuccess 对用户并不友好。因此，我们扩展了 TaskResult，使其可以这样写：

public struct HogeFeature: Reducer {
  public struct State: Equatable {}
  public enum Action: Equatable {
    case onAppear
    case response(TaskResult<VoidSuccess>)
  }

  public func reduce(into state: inout State, action: Action) -> Effect<Action> {
    switch action {
    case .onAppear:
      return .run { send in
        await send(
          .response(
            TaskResult {
              try await asyncThrowsVoidFunc()
            }
          )
        )
      }
    case .response(.success):
      // do something
      return .none

    case .response(.failure(let error)):
      // handle error
      return .none
    }
  }
}

安装

在依赖项部分，添加

.package(url: "https://github.com/Ryu0118/swift-composable-architecture-extras", from: "1.0.0")

在每个模块中，添加

.target(
  name: "MyModule",
  dependencies: [
    .product(name: "ComposableArchitectureExtras", package: "swift-composable-architecture-extras")
  ]
),