Question

例如..我想将一些字典传入其初始化程序中的一个类，我想在我的类中引用这些字典..问题是当我将它们设置为属性时，它们实际上是被复制的，而不是引用。

示例：

var activeDict: [Int: Projectile]
var inactiveDict: [Int: Projectile]

init(inout activeDict: [Int: Projectile], inout inactiveDict: [Int: Projectile]) {
    self.activeDict = activeDict
    self.inactiveDict = inactiveDict

我希望在班上使用activeDict和inactiveDict。我希望它们成为传入原件的参考。

Answer 1

你可以将UnsafeMutablePointer存储到字典中，这是一个在操场上测试的例子：

var dict = ["hejj": 1]

class A<T> {
    var myDictRef: UnsafeMutablePointer<T>

    init(ref: UnsafeMutablePointer<T>) {
        self.myDictRef = ref
    }
}

let a = A(ref: &dict)
a.myDictRef.memory["asd"] = 3
a.myDictRef.memory
dict

<强>更新

在你的情况下使用它：

var activeDict: UnsafeMutablePointer<[Int: Projectile]>
var inactiveDict: UnsafeMutablePointer<[Int: Projectile]>

init(activeDict: UnsafeMutablePointer<[Int: Projectile]>, inactiveDict: UnsafeMutablePointer<[Int: Projectile]>) {
    self.activeDict = activeDict
    self.inactiveDict = inactiveDict
}

每当你想使用activeDict或inactiveDict时，你可以用它们的内存属性调用指针后面的字典，如：

activeDict.memory[YourKey] = YourValue

swift：我可以拥有一个实际上是参考的属性吗？

1 个答案: