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今天遇到了这个问题，错误如下：
duplicate symbol _OBJC_IVAR_$_BCViewController.bank in: /Users/***/Library/Developer/Xcode/DerivedData/***-fmtpkcbvfajuuadtvwtzfyjxoywz/Build/Intermediates/***.build/Debug-iphonesimulator/***.build/Objects-normal/x86_64/BCViewController-56817B2065459D6D.o /Users/***/Library/Developer/Xcode/DerivedData/***-fmtpkcbvfajuuadtvwtzfyjxoywz/Build/Intermediates/***.build/Debug-iphonesimulator/***.build/Objects-normal/x86_64/BCViewController-B4FDBEBA5F30059F.o
ld: 11 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
网上有说是因为存在同名的文件。刚开始没发现，后来仔细查找后果然是这个问题！！
参考：duplicate symbols for architecture armv7解决办法
【iOS】duplicate symbols for architecture x86_64
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原文地址：http://www.cnblogs.com/jaxer/p/4953254.html
