-->相同类，不同地址


duplicatesymbol_OBJC_CLASS_$_TTDataReportin:
/Users/youlinmac/Library/Developer/Xcode/DerivedData/client-afzozhjxxecgofdppfwzdmoalrxm/Build/Intermediates/client.build/Debug-iphoneos/ttaxx.build/Objects-normal/arm64/TTDataReport-CE222134F89CC50.o
/Users/youlinmac/Library/Developer/Xcode/DerivedData/client-afzozhjxxecgofdppfwzdmoalrxm/Build/Intermediates/client.build/Debug-iphoneos/ttaxx.build/Objects-normal/arm64/TTDataReport-6F254BC198D6539.o


找了半天，原来是在其他文件夹有一个跟报错类一样的类。全局搜一下就出来了。