如何复制“字典"在斯威夫特? [英] How to copy a "Dictionary" in Swift?

问题描述

如何在 Swift 中复制字典"?

How to copy a "Dictionary" in Swift?

即获取另一个具有相同键/值但内存地址不同的对象.

That is, get another object with same keys/values but different memory address.

另外，如何在 Swift 中复制一个对象?

Furthermore, how to copy an object in Swift?

谢谢，

推荐答案

一个'Dictionary'在swift中其实是一个Struct，是一个值类型.所以复制它很简单:

A 'Dictionary' is actually a Struct in swift, which is a value type. So copying it is as easy as:

let myDictionary = ...
let copyOfMyDictionary = myDictionary

复制一个对象(它是一个引用类型)有几个不同的答案.如果对象采用 NSCopying 协议，那么你可以这样做:

To copy an object (which is a reference type) has a couple of different answers. If the object adopts the NSCopying protocol, then you can just do:

let myObject = ...
let copyOfMyObject = myObject.copy()

如果您的对象不符合 NSCopying 那么您可能无法复制该对象.根据对象的类，它可能会提供自己的方法来获取副本，或者如果对象没有内部私有状态，那么您可以创建一个具有相同属性的新对象.

If your object doesn't conform to NSCopying then you may not be able to copy the object. Depending on the object's class it may provide it's own method to get a duplicate copy, or if the object has no internal private state then you could create a new object with the same properties.

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