架构i386的重复符号错误？

Question

我得到跟随错误，而建设应用程序。

我检查了下面的内容，但错误仍然没有消失

1. file exists twice.
2. Import ".m" intead of .h
3. `File missing`
4. Duplicate function

还有其他的检查吗？

 duplicate symbol _downloadCompleted in:
   /Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/Middleware.o
    Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/ZipArchive.o
duplicate symbol _onDownloadCompleted in:
   Developer/Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/Middleware.o
   Library/Developer/Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/ZipArchive.o
duplicate symbol _onImageDownloadCompleted in:
    Developer/Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/Middleware.o
    Developer/Xcode/DerivedData/WAI2go-ckzrqcnbjsisokcplqkvzwxhclrg/Build/Intermediates/WAI2go.build/Debug-iphonesimulator/WAI2go.build/Objects-normal/i386/ZipArchive.o
ld: 3 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

全局变量会导致这类问题。

Answer 2

在您的代码中，有两个具有相同接口名称的不同文件。

当您使用包含已导入到项目的类的自定义SDK时，会发生这种情况。