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iOS底层原理总结 - 关联对象实现原理 - 简书
source link: https://www.jianshu.com/p/0f9b990e8b0a?
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面试题 Category能否添加成员变量？如果可以，如何给Category添加成员变量？答：不能直接添加成员变量，但是可以通过runtime的方式间接实现添加成员变量的效果。 RunTime为Category动态关联对象 使用RunTime给系统的类添加属性，首先需要了解对象与属性的关系。我们通过之前的学习知道，对象一开始初始化的时候其属性为nil，给属性赋值其实就是让属性指向一块存储内容的...
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