iOS问题研究之一：应该使用 instance variable还是property - 代码天地

iOS问题研究之一：应该使用 instance variable还是property

移动开发 2018-05-12 14:47:28 阅读次数: 2

JOHN GALLAGHER在博客里面说，多多建议使用property而很少使用ivar。原因有property更有利于debug和log，但是针对于performance来说，property要优于ivar，主要是ivar在get或是set方法中，调用objc_msgSend将函数名字存到寄存器中，而ivar则直接使用立即数放在寄存器直接操作，但这两种方式都是纳秒级别的，影响很小。所以为了便于log和debug，还是尽可能的使用property。

from： http://blog.bignerdranch.com/4005-should-i-use-a-property-or-an-instance-variable/

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转载自mirthor.iteye.com/blog/2017368

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