将NSMutableDictionary的内容复制到另一个NSMutableDictionary中？ [英] Copying the contents of an NSMutableDictionary into another NSMutableDictionary?

问题描述

我有一个 NSMutableDictionary 其中每个元素都是另一个字典。我可以将其内容复制到另一个 NSMutableDictionary 的最佳方法是什么？我尝试过使用：

I have an NSMutableDictionary each element of which is another dictionary. What is the best way I can copy its contents into another NSMutableDictionary? I've tried using:

firstDictionary = [NSMutableDictionary dictionaryWithDictionary:secondDictionary];

但不确定这是否是最佳方式。

However not sure if this is the best way to do it.

推荐答案

检查NSDictionary initWithDictionary：copyItems：方法。

Check the NSDictionary initWithDictionary:copyItems: method.

它可以通过调用copyWithZone：item类的方法来深度复制元素。您必须自己在方法中自己复制字段。

It it enables deep copying of elements thru calling copyWithZone: method of item's class. You will have to take care of copying the fields yourself within the method.

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