条件绑定的初始化程序必须具有可选类型，而不是'Error.Protocol'

Question

我正在创建一个函数，用于在其中验证密码，我尝试对其进行调试并寻找可能的解决方案，但似乎我无法为其寻找更好的解决方案。

 func validateEventPasscode(){
        //Show Loading
        self.view.squareLoading.start(0.0)

        let api = APIService ()

        api.validatePasscode(eventcode: eventCode) { (data, error) in

            guard let eventDetails = self.event, error == nil else {

                if let networkError = Error.self {

                    if networkError == .InvalidCredentials {
                        _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")
                    }else {
                        _ = SCLAlertView(appearance: appearance).showError("Network Error", subTitle: "\(networkError.rawValue)")
                    }
                }

                self.view.squareLoading.stop(0.0)
                return
            }
          guard eventDetails.deleteFlag == false else {

          _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")

         self.view.squareLoading.stop(0.0)

        return
       }

      if (eventDetails.closedFlag == true && eventDetails.reopenFlag == false) {
       _ = SCLAlertView(appearance: appearance).showError("Closed Event", subTitle: "Please check the status of your event and try again")

       self.view.squareLoading.stop(0.0)
       return
      }

.InvalidCredentials来自何处

enum NetworkError: Error {

   case InvalidCredentials
   case custom(String)
   case other

 }

extension NetworkError: LocalizedError {
   var errorDescription: String? {
     switch self {
        case .InvalidCredentials:
            return "Invalid event code"
        case .other:
            return "Something went wrong"
        case .custom:(let message):
            return message
     }
   }
 }

我将此链接用作我在 validatePasscode validatePasscode reference

中使用的APIService的参考

Answer 1

似乎您正在尝试将error强制转换为Error类型的对象，可以这样做

               if let networkError = error as? Error {

                if networkError == .InvalidCredentials {
                    _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")
                }else {
                    _ = SCLAlertView(appearance: appearance).showError("Network Error", subTitle: "\(networkError.rawValue)")
                }
            }

编辑-这是您的固定代码

enum NetworkError: Error {
   case invalidCredentials
   case custom(String)
   case other
}

extension NetworkError: LocalizedError {
   var errorDescription: String? {
     switch self {
        case .invalidCredentials:
            return "Invalid event code"
        case .other:
            return "Something went wrong"
        case .custom(let message):
            return message
      }
   }
}

func validateEventPasscode() {
        //Show Loading
        self.view.squareLoading.start(0.0)

        let api = APIService()
        api.validatePasscode(eventcode: eventCode) { (data, error) in

            guard let eventDetails = self.event, error == nil else {
                guard let error = error as? NetworkError else { return }

                switch error {
                case .invalidCredentials:
                    _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")

                case .custom(let message):
                    print(message)

                case .other:
                    _ = SCLAlertView(appearance: appearance).showError("Network Error", subTitle: "\(networkError.rawValue)")
                }


                self.view.squareLoading.stop(0.0)
                return
            }

            guard !eventDetails.deleteFlag else {
                _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")
                self.view.squareLoading.stop(0.0)
                return
            }

            if eventDetails.closedFlag, !eventDetails.reopenFlag {
                _ = SCLAlertView(appearance: appearance).showError("Closed Event", subTitle: "Please check the status of your event and try again")

                self.view.squareLoading.stop(0.0)
                return
            }
        }
    }

Answer 2

您必须可选地绑定可选的error 参数，而不是非可选的Error 类型。

我建议使用这种语法（eventDetails似乎没用）

func validateEventPasscode(){
    //Show Loading
    self.view.squareLoading.start(0.0)

    let api = APIService ()

    api.validatePasscode(eventcode: eventCode) { (data, error) in
        if let networkError = error {
            if networkError == .InvalidCredentials {
                _ = SCLAlertView(appearance: appearance).showError("Ooops!", subTitle: "Please enter a valid event passcode")
            } else {
                _ = SCLAlertView(appearance: appearance).showError("Network Error", subTitle: "\(networkError.rawValue)")  
            }
        } else {
            self.view.squareLoading.stop(0.0)
        }
    }
}