GCDAsyncUdpSocket错误,Undefined symbols for architecture arm64:  "_OBJC_CLASS_$_GCDAsyncUdpSocket", re

GCDAsyncUdpSocket用来和硬件进行广播信息交流,很简单,很好用。 添加GCDAsyncUdpSocket工具库,出现以下错误: ------------------------------------------------------------------------ Undefined symbols for architecture arm64:   "_OBJC_CLASS
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