为什么 NSDictionary 报告一个不寻常的类名? [英] Why does NSDictionary report an unusual class name?

问题描述

NSDictionary *dict = [NSDictionary dictionary];
NSLog(@"%@", NSStringFromClass([dict class])); 

此代码打印__NSDictionary0".

This code prints "__NSDictionary0".

对于我自己的类，它打印实际的类名.

For my own classes it prints the actual class name.

为什么将 NSDictionary 标识为 __NSDictionary0，依赖它是否安全?

Why is NSDictionary identified as __NSDictionary0, and is it safe to depend on this?

推荐答案

NSDictionary 是一个类簇.在此处阅读有关它们的信息:

NSDictionary is a class cluster. Read about them here:

可可基础指南

由于实际"类本身是私有的，不，依赖它不安全.

As the "actual" class itself is private, no, it is not safe to depend on this.

如果你需要知道你的类是否真的是一个 NSDictionary，使用 [dict isKindOfClass:[NSDictionary class]];

If you need to know if your class is really an NSDictionary or not, use [dict isKindOfClass:[NSDictionary class]];

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