isa 指針

原創 wangchen2009hao 2020-02-24 08:05

每個對象都有一個 isa 指針，指向內存裏面的對象，對象裏面保存的是方法列表，調用對象的方法的時候就是通過 isa 指針找到對應的類的地址，調用方法列表

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