+(void)Load 定义 123 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 赞微海报分享
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