相关疑难解决方法(0)

使用Swift,来自Java背景,为什么要选择Struct而不是Class？看起来它们是相同的,使用Struct提供更少的功能.为什么选择呢？

我想分享一些枚举属性.就像是:

enum State {
  case started
  case succeeded
  case failed
}

enum ActionState {
  include State // what could that be?
  case cancelled
}

class Action {
  var state: ActionState = .started

  func set(state: State) {
    self.state = state
  }

  func cancel() {
    self.state = .cancelled
  }
}

我明白为什么ActionState不能继承State(因为状态cancelled没有表示State)但我仍然可以说"ActionState就像具有更多选项的State,而ActionState可以获得State类型的输入,因为它们也是输入ActionState"

我看到如何使用上述逻辑来复制案例ActionState并在set函数中进行切换.但我正在寻找一种更好的方法.

我知道枚举不能在Swift中继承,我已经阅读了swift-enum-inheritance的协议答案.它没有解决"继承"或包含来自另一个枚举的案例的需要,而只涉及属性和变量.

I am trying to create an inheritance for below enum

enum BankAuthError: String {
    case authFailed = "AuthFailed"
    case technicalError = "Unavailable"
    case accountLocked = "Locked"
    case unknownError = "UnknownError"
    case userInteractionRequired = "UserInteractionNeeded"
    case realmUserAlreadyConnected = "UserExists"
}

I am able to use this enum as below

let errorCode = BankAuthError(rawValue:errorMessageCodeString)

Now I am trying to create inheritance from above struct as below

//MARK:- Enum to handle all sysnc errors
enum SyncErrorStatus: BankAuthError {
 case usernameOrPasswordMissing = "UsernameOrPasswordMissing"
 case …