如果要使用与枚举大小写关联的值，则必须以这种方式进行切换：

enum SHError: Error {

    case InvalidInputError(code: Int,message: String,info: [String:Any]? = [:])
    case InvalidProcessingError(code: Int,info: [String:Any]? = [:])

    var debugDescription: String {
        let code: Int
        switch self {
        case .InvalidInputError(code: let codeValue,message: _,info: _):
            code = codeValue
        case .InvalidProcessingError(code: let codeValue,info: _):
            code = codeValue
        }
        return "debug info: code: \(code)"
    }

    var localizedDescription: String {
        return "description: \(self)"
    }
}

或者您可以创建一个单独的计算变量var code: Int并在debugDescription中使用它：

enum SHError: Error {

    case InvalidInputError(code: Int,info: [String:Any]? = [:])

    var debugDescription: String {
        return "debug info: code: \(code)"
    }

    var localizedDescription: String {
        return "description: \(self)"
    }

    var code: Int {
        switch self {
        case .InvalidInputError(code: let code,info: _):
            return code
        case .InvalidProcessingError(code: let code,info: _):
            return code
        }
    }
}