iOS Clang錯誤-Xcode5

Question

我已經在Google和stackoverflow上看到了幾處與此錯誤相關的帖子，盡管我已經閱讀了所有文章，但仍能解決問題，對於解決方案我很高興。 這是我在編譯時收到的錯誤消息。

duplicate symbol _OBJC_IVAR_$_crc_assess_q1.answers in:
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q2.o
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q1.o
duplicate symbol _OBJC_IVAR_$_crc_assess_q1._assessQuestion1Label in:
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q2.o
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q1.o
duplicate symbol _OBJC_IVAR_$_crc_assess_q1._answer1Table in:
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q2.o
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q1.o
duplicate symbol _OBJC_CLASS_$_crc_assess_q1 in:
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q2.o
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q1.o
duplicate symbol _OBJC_METACLASS_$_crc_assess_q1 in:
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q2.o
    /Users/somefolder/Library/Developer/Xcode/DerivedData/CRC-cwtaapkjcvsdiaddtmdolovjtsgf/Build/Intermediates/CRC.build/Debug-iphonesimulator/CRC.build/Objects-normal/i386/crc_assess_q1.o
ld: 5 duplicate symbols for architecture i386

clang：錯誤：鏈接器命令失敗，退出代碼為1（使用-v查看調用）

Answer 1

我假設您的項目目錄中有重復的文件，請檢查
Build Phases>Compile Sources項目的Build Phases>Compile Sources ，然后查看是否存在兩個以上具有相同名稱的文件