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类<协议名>*变量名 这是什么写法

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类<协议名>*变量名 这是什么写法

看到有个人这么写，这个到底是什么意思，有没有什么文章可以看一下。例如UIButton<protocol>* variateName 这是个什么鬼？


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遵守某protocol协议的UIButton类的变量


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