經典錯誤：symbol(s) not found for architecture x86_64 || Undefined symbols for architecture x86_64:

記錄經典，防止踩坑！！！！！   真機可以運行，模擬器報錯。 錯誤信息顯示如下： Ld /Users/lyj/Library/Developer/Xcode/DerivedData/G42PayBucketDemo-gtrplkdamuwrabcpmyhxodgbqlgw/Build/Products/Debug-iphonesimulator/G42PayBucketDemo.app/G42Pa

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