写了一段代码 之前测试的时候可以运行 后来不知道加了什么引起报错，报错如下：
duplicate symbol OBJC_IVAR$_WordChooser._theword in:
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/gamemodel.o
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/WordChooser.o
duplicate symbol OBJC_METACLASS$_WordChooser in:
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/gamemodel.o
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/WordChooser.o
duplicate symbol OBJC_CLASS$_WordChooser in:
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/gamemodel.o
/Users/themacairof202/Library/Developer/Xcode/DerivedData/test_file_1-bjtlsetupimkydblqinsnpxunfav/Build/Intermediates/test file 1.build/Debug-iphonesimulator/test file 1.build/Objects-normal/i386/WordChooser.o
ld: 3 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
大约意思是说程序里有重复的文件？求解怎么排查
你搜索一下这个关键字 WordChooser ，看看是否存在两个模块
从报错来看， 是 gamemodel 和 WordChooser 中有重复的模块
直接删掉去文件夹试试,当然,删之前留个备份= =路径不好找,打开终端,输入open 空格 然后粘贴上路径.
/Users/themacairof202/Library/Developer/Xcode/DerivedData这个删了重新build试下，放心，这个是编译后的临时文件
duplicate symbol
这个意思你文件有重复的，根据推测，重复引用了，或者项目中有重复的文件