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修改笔误 #3

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修改笔误 #3

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4 changes: 2 additions & 2 deletions iOS知识点/iOS底层/4、KVC.md
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Expand Up @@ -43,7 +43,7 @@ KVC（Key-value coding）键值编码，指iOS的开发中，可以允许开发

### 2、KVC的内部实现机制

#### KVO的`setValue:forKey`原理
#### KVC的`setValue:forKey`原理

我们先来一张图片可以直接明了的看清楚实现原理
![KVC2](https://github.com/SunshineBrother/JHBlog/blob/master/iOS知识点/images/KVC2.png)
Expand All @@ -54,7 +54,7 @@ KVC（Key-value coding）键值编码，指iOS的开发中，可以允许开发
- 返回NO，直接调用`setValue:forUndefinedKey:`，抛出异常


#### KVO的`ValueforKey`原理
#### KVC的`ValueforKey`原理
![KVC3](https://github.com/SunshineBrother/JHBlog/blob/master/iOS知识点/images/KVC3.png)
- 1、按照`getKey,key,isKey,_key`的顺序查找`成员方法`，如果找到直接调用`取值`
- 2、如果没有找到，查看`accessInstanceVariablesDirectly`的返回值
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