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

GCDAsyncUdpSocket用來和硬件進行廣播信息交流，很簡單，很好用。 添加GCDAsyncUdpSocket工具庫，出現以下錯誤： ------------------------------------------------------------------------ Undefined symbols for architecture arm64:   "_OBJC_CLASS

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