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Update 1.74.md

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Fixed a typo.
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Legolas Wang
2020-07-07 10:02:19 -07:00
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Chapter1 - iOS/1.74.md
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@@ -3010,7 +3010,7 @@ CFNetwork 使用 CFReadStreamRef 来传递数据，使用回调函数的形式
想想 KVO 的实现原理？结合上面的图
- 创建监控对象子类
- 重写子类中属性的 getter、seeter
- 重写子类中属性的 getter、setter
- 将监控对象的 isa 指针指向新创建的子类
- 在子类的 getter、setter 中拦截值的变化，通知监控对象值的变化
- 监控完之后将监控对象的 isa 还原回去