根据教程构建iOS应用程序，我收到以下消息：
Ld /Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Products/Debug-iphonesimulator/FirstGame.app/FirstGame normal i386
cd /Users/EvanBresnan/Documents/Xcode/FirstGame
export IPHONEOS_DEPLOYMENT_TARGET=9.2
export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.2.sdk -L/Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Products/Debug-iphonesimulator -F/Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Products/Debug-iphonesimulator -filelist /Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Intermediates/FirstGame.build/Debug-iphonesimulator/FirstGame.build/Objects-normal/i386/FirstGame.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=9.2 -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -dependency_info -Xlinker /Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Intermediates/FirstGame.build/Debug-iphonesimulator/FirstGame.build/Objects-normal/i386/FirstGame_dependency_info.dat -o /Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Products/Debug-iphonesimulator/FirstGame.app/FirstGame
duplicate symbol _HighScoreNumber in:
/Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Intermediates/FirstGame.build/Debug-iphonesimulator/FirstGame.build/Objects-normal/i386/ViewController.o
/Users/EvanBresnan/Library/Developer/Xcode/DerivedData/FirstGame-ekyyaqwhjsjimddxggwkkkgblylu/Build/Intermediates/FirstGame.build/Debug-iphonesimulator/FirstGame.build/Objects-normal/i386/Game.o
ld: 1 duplicate symbol for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
2 回答
来自错误消息
我猜你在两个文件中声明了全局变量_HighScoreNumber（或者可能在两个文件中导入的 Headers 中） . 检查声明_HighScoreNumber的位置和方式，并将其移动到正确的位置 .
我最近面临同样的问题 . 我知道 E. Brez 得到了答案，但是为了帮助那些可能遭遇同样问题的其他人 .
根据我的应用程序流程，我使用打印机相关的第三方类进行打印 . 为了使用它我分别在我的文件
ImagePrintViewController和PrintResultViewController中创建了该类的对象，并将所需的数据传递给它 .在我的场景中，我在我的两个文件
/Library/Developer/Xcode/DerivedData/../x86_64/ImagePrintViewController.o和/Library/Developer/Xcode/DerivedData/../x86_64/PrintResultViewController.o中得到了与变量名称相同的错误，如_printerSetup.我在我的两个文件中都搜索了上面的变量名 . 但我找不到 .
经过长时间的搜索，我得到了第二个文件 delete reference 的想法，即在我的第一个文件中合并代码后
BRPrintResultViewController.h和BRPrintResultViewController.m.有了这个，我找到了我的解决方案，我的代码运行良好 .