Question

我想在我的类中获取变量的值（作为字符串传递）并正确地进行转换。这是我到目前为止所做的。

// Playground - noun: a place where people can play

import UIKit

class Test: NSObject {
    var stringVar = "Some String"
    var arrayVar = ["Some", "Array"]

    override init() {
        super.init()

        var dynamicKey = "stringVar"
        var valueForKeyResult1: AnyObject! = valueForKey(dynamicKey)

        dynamicKey = "arrayVar"
        var valueForKeyResult2: AnyObject! = valueForKey(dynamicKey)

        var someVarName = valueForKeyResult2
    }
}

Test()

现在我如何获得var valueForKeyResult 1＆amp; 2首先将它们变成了它们的类型（不知道它们是什么类型）？

Answer 1

它们已经是正确的类型：

class Test: NSObject {
    var stringVar = "Some String"
    var arrayVar = ["Some", "Array"]

    override init() {
        super.init()

        var dynamicKey = "stringVar"
        var valueForKeyResult1: AnyObject! = valueForKey(dynamicKey)
        println("valueForKeyResult1: \(NSStringFromClass(valueForKeyResult1?.dynamicType)), value: \(valueForKeyResult1!)\n")

        dynamicKey = "arrayVar"
        var valueForKeyResult2: AnyObject! = valueForKey(dynamicKey)
        println("valueForKeyResult2: \(NSStringFromClass(valueForKeyResult2?.dynamicType)), value: \(valueForKeyResult2!)\n")
    }
}

Test()

输出：

valueForKeyResult1：Swift._NSContiguousString，value：Some String

valueForKeyResult2：_TtCSs23_ContiguousArrayStorage000000010050D510，值:(       一些，       排列   ）

如何将valueForKey的结果转换为swift中的正确类型？

1 个答案: