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我需要访问一个在嵌套枚举上定义的函数。我的设置如下：

var currentlyShowingStepIndex:Int?
var allSetupSteps:[SetupStep] = []

enum SetupStep {
    case districtSetupStep(DistrictSetupStep), toolSetupStep(ToolSetupStep)

    enum DistrictSetupStep {
        case one, two, three
    }

    enum ToolSetupStep {
        case one, two, three

        func accessMe() -> Int {
            switch self {
                case one:
                    return 1
                case two:
                    return 2
                case three:
                    return 3
            }
        }
    }
}

if let index = currentlyShowingStepIndex {
    let currentStep = allSetupSteps[index]
    switch currentStep {
    case .districtSetupStep(_):
        print("asdf")

    // **** I have no idea for the syntax of the following, the code below does not work *****
    case .toolSetupStep(_) let toolStep:
        let numberNeeded = toolStep.accessMe()
    }
}

我试图获取上面的值“numberNeeded”，但我不知道访问它的语法是什么，或者是否可能。