昨晚，当我完成项目工作时，没有错误。但今天，当我打开我的项目时，我遇到了Apple Mach-O链接（id）错误。这是错误：`Ld /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Products/Debug-iphonesimulator/WhereAmI.app/WhereAmI normal i386 cd“/ Users / chandlerdeangelis / Desktop / Real Estate App” setenv MACOSX_DEPLOYMENT_TARGET 10.6 setenv PATH“/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/ usr / sbin目录：/ sbin目录” /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5。 1.sdk -L / Users / chandlerdeangelis / Library / Developer / Xcode / DerivedData / WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa / Build / Products / Debug-iphonesimulator -F / Users / chandlerdeangelis / Library / Developer / Xcode / DerivedData / WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa / Build / Products / Debug-iphonesimulator -filelist /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmI.LinkFileList - mmacosx-version-min = 10.6 -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED = 50100 -framework MapKit -framework CoreLocation -framework UIKit -framework Foundation-framework CoreGraphics - o /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Products/Debug-iphonesimulator/WhereAmI.app/WhereAmI
重复符号_OBJC_IVAR _ $ _ WhereAmIAppDelegate._window in： /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIAppDelegate.o /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIViewController.o 重复符号_OBJC_IVAR _ $ _ WhereAmIAppDelegate._viewController in： /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIAppDelegate.o /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIViewController.o 重复符号_OBJC_METACLASS _ $ _ WhereAmIAppDelegate in： /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIAppDelegate.o /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIViewController.o 重复符号_OBJC_CLASS _ $ _ WhereAmIAppDelegate in： /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIAppDelegate.o /Users/chandlerdeangelis/Library/Developer/Xcode/DerivedData/WhereAmI-bdyziqhatjrwffgkgfvwvtoxdroa/Build/Intermediates/WhereAmI.build/Debug-iphonesimulator/WhereAmI.build/Objects-normal/i386/WhereAmIViewController.o ld：架构i386的4个重复符号 clang：错误：链接器命令失败，退出代码为1（使用-v查看调用） ` 任何人都可以帮助我吗？
答案 0 :(得分：1)
几个符号（WhereAmIAppDelegate._window，WhereAmIAppDelegate._viewController，...）被定义为重复：在 WhereAmIAppDelegate.o 和 WhereAmIViewController.o 。
此错误的一个可能原因是您在某处导入了“.m”文件而不是“.h”文件。也许你在 WhereAmIViewController.m 中有一个#import "WhereAmIAppDelegate.m"？