Xcode - 链接器命令失败并显示退出代码

Question

Xcode 遇到一个奇怪的问题，没有代码问题，我不知道如何处理这个问题。我也使用谷歌并看到类似的问题，但答案对我没有用。

duplicate symbol _OBJC_IVAR_$_Level._name in:
..../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build /Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C98F33E28EFA5297.o
/Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C635B4AD47A32079.o
 duplicate symbol _OBJC_IVAR_$_Level._type in:
...../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C98F33E28EFA5297.o
...../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C635B4AD47A32079.o
 duplicate symbol _OBJC_IVAR_$_Level._binaryImage in:
...../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C98F33E28EFA5297.o
..../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C635B4AD47A32079.o
 duplicate symbol _OBJC_CLASS_$_Level in:
..../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C98F33E28EFA5297.o
... ../Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C635B4AD47A32079.o
duplicate symbol _OBJC_METACLASS_$_Level in:
...Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C98F33E28EFA5297.o
......Library/Developer/Xcode/DerivedData/MobileMaps-bfaaljugbcgusoazfkvdbpbdyiqf/Build/Intermediates/MobileMaps.build/Debug-iphonesimulator/MobileMaps.build/Objects-normal/i386/Level-C635B4AD47A32079.o

ld: 5 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

从我读到的内容来看，这个问题有很多不同的原因，因此有很多不同的解决方案，但也许有人会做和我一样的愚蠢的事情，这会对他们有所帮助。我相当确定这不是OP遇到的问题，因为我的重复符号位于不同名称的.o文件中。

基本上，在输入 #import 语句时要非常小心自动更正。我不小心导入了 .m 文件而不是正确的 .h 文件，最终得到的输出类似于 OP 发布的内容。

希望这对某人有帮助！