@compatibility_alias
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@compatibility_alias
参考文档
This is a feature of the Objective-C compiler rather than of the runtime, anyway since it is documented nowhere and its existence was forgotten, we are documenting it here.
The keyword @compatibility_alias allows you to define a class name as equivalent to another class name
这是不是运行时的Objective-C编译功能,不过既然是记录的地方和它的存在被遗忘,我们记录在这里。关键词@ compatibility_alias允许你定义一个类的名字等同于另一个类的名字
例子
@compatibility_alias VIEW_CLASS UIView;
VIEW_CLASS 就等同于UIView
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