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2026-01-02 10:28:57 +08:00
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Chapter1 - iOS/1.48.md
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@@ -1177,7 +1177,7 @@ c 数组指针 `array()->lists + addedCount` 可以代表其中的位置。
过程如下
![](./../assets/runtime-categoryattachLists.png)
![](https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/runtime-categoryattachLists.png)
结果就是类方法列表中，最前面的就是所有分类的方法列表，最后是类自身的方法列表。
@@ -1334,7 +1334,7 @@ Demo: 为 Person 类创建2个 Category，分别存在同名方法 study，具
}
```
<img src="./../assets/OCCategoryMethodOrderExplore.png" style="zoom:25%">
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/OCCategoryMethodOrderExplore.png" style="zoom:25%">
可以看到 sayHi 方法存在多个，但是由于 Category 同名的方法在方法列表的前面，所以类自身的方法实现”被覆盖了“（根据 isa 查找方法实现的时候，优先查找到 Category 的方法实现，则停止查找了）
@@ -1347,17 +1347,17 @@ Demo: 为 Person 类创建2个 Category，分别存在同名方法 study，具
Demo: 为 Person 类创建2个 Category，分别存在同名方法 study，具有不同实现。探索编译顺序决定方法实现
<img src="./../assets/OCCategoryBuildOrderDemo1.png" style="zoom:25%">
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/OCCategoryBuildOrderDemo1.png" style="zoom:25%">
2个对比实验：
让 `Person+Study` 参与后编译
<img src="./../assets/OCCategoryBuildOrderDemo2.png" style="zoom:25%">
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/OCCategoryBuildOrderDemo2.png" style="zoom:25%">
让 `Person+Learn` 参与后编译
<img src="./../assets/OCCategoryBuildOrderDemo3.png" style="zoom:25%">
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/OCCategoryBuildOrderDemo3.png" style="zoom:25%">
@@ -2304,7 +2304,7 @@ Person +load
查看分类在 Runtime 加载类信息时候的调用原理可以知道，分类中的类方法、对象方法都会被加载原始类的前面去（initialize 是类方法）如下图：
![](./../assets/runtime-categoryattachLists.png)
![](https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/runtime-categoryattachLists.png)
### 为什么给子类发消息，父类和子类的 +initialize 都会被调用？且父类的先调用
@@ -3059,7 +3059,7 @@ void _object_set_associative_reference(id object, void *key, id value, uintptr_t
梳理后，如下图所示：
<img src="./../assets/AssociatedSaveValueInRuntimeStructure.png" style="zoom:45%">
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/AssociatedSaveValueInRuntimeStructure.png" style="zoom:45%">
AssociationsManager 管理的 AssociationsHashMap 结构如下：
@@ -3178,7 +3178,7 @@ NS_ASSUME_NONNULL_END
### 声明私有方法
<img src="./../assets/CategoryUsageDeclPrivateMethod.png" style="zoom:30%" />
<img src="https://raw.githubusercontent.com/FantasticLBP/knowledge-kit/master/assets/CategoryUsageDeclPrivateMethod.png" style="zoom:30%" />