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Runtime 第七题：Category 和 Extension 有什么区别 #31

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Brances opened this issue Dec 24, 2020 · 2 comments
Open

Runtime 第七题：Category 和 Extension 有什么区别 #31

Brances opened this issue Dec 24, 2020 · 2 comments

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@Brances
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Brances commented Dec 24, 2020

--类拓展 不能给系统的类添加方法
这里是不是描述错了，应该是可以给系统类添加方法的吧？
@liberalisman
@x554960766
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Extension一般用来隐藏类的私有消息，你必须有一个类的源码才能添加一个类的Extension，所以对于系统一些类，如NSString，就无法添加类扩展

@Brances
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Brances commented Jul 28, 2021

@xluoyeyoushang 是的，我弄错了，应该是category可以添加方法

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@Brances @x554960766