kotlin - 如何执行伴随对象 lateinit 是初始化检查

Question

如果我有一个 lateinit 变量，我可以检查它是否使用 (this::lateInitVar.isInitialized) 初始化，如 https://stackoverflow.com/a/47860466/3286489 所示

但是，如果变量是伴随对象，我怎么能这样做呢？

例如

class MyClass {

    companion object {
        lateinit var myGlobalLateInit: String
    }

    lateinit var myLocalLateInit: String

    fun settingVariable() {
        if (!this::myLocalLateInit.isInitialized) {
            myLocalLateInit = "I am set"
        }

        if (!MyClass::myGloablLateInit.isInitialized) { // This line will error out. How could I set it?
            myGloablLateInit = "I am set"
        }

    }

}

Answer 1

您可以将其提取到伴随对象内的函数中:

class MyClass {

    companion object {
        lateinit var myGlobalLateInit: String

        fun isMyGlobalLateInitInitialized() = ::myGlobalLateInit.isInitialized
    }

    fun settingVariable() {
        if (!isMyGlobalLateInitInitialized()) {
            myGlobalLateInit = "I am set"
        }

    }

}