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我试图了解UIAppearance. 协议的两种方法都UIAppearance返回一个类型为 的“外观代理” id。这个“外观代理”是什么？是不是类似于 File's Owner 代理，一个以后会填写的对象？它如何改变屏幕对象的外观？
UIAppearance
id