我目前正在学习如何使用 Objective-C 我正在做一个涉及类的简单项目，我决定将它放入 Xcode 中进行一些简单的可视化调试，但是在消除所有错误和警告后，我遇到了：
duplicate symbol _OBJC_IVAR_$_Customer._fName in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_IVAR_$_Customer._lName in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_IVAR_$_Customer._age in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_IVAR_$_Customer._rank in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_IVAR_$_Customer._intention in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_METACLASS_$_Customer in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
duplicate symbol _OBJC_CLASS_$_Customer in:
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/main.o
/Users/Slench/Library/Developer/Xcode/DerivedData/NameRankIntention-hlaqvlslfjimqdeysxqiyloirdus/Build/Intermediates/NameRankIntention.build/Debug/NameRankIntention.build/Objects-normal/x86_64/NRaI.o
ld: 7 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
现在奇怪的是，我将“固定代码”放回 Sublime Text 中，在那里我保存了它，然后通过终端编译它，它工作得很好没有错误没有警告什么都没有
我已经阅读了有关此的其他一些问题，解决方案要么始终是他们找到了重复声明，要么他们有一个同名的额外文件导致重复声明......我都没有。 ..
所以……有什么帮助吗？