+(void)Load

定义

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Invoked whenever a class or category is added to the Objective-C runtime; implement this method to perform class-specific behavior upon loading.

每当将类或类别添加到Objective-C运行时时调用；实现此方法以在加载时执行特定于类的行为。

加载顺序

class > subClass > category > 文件添加顺序靠后的 category

+(void)inilized