出错总结

Unsupported compiler 'com.apple.compilers.llvmgcc42' selected for architectu

如果出现如上编译错误:
Change your compiler for C/C++/ObjectiveC Go to Build Settings->Build OPtions->compiler for C/C++/ObjectiveC; select Default(Apple LLVM7.0)

UIWebViewDemo_xcodeproj.png

90%"duplicate symbol OBJC_CLASS$_test1ViewController in:"的错误都是
1.因为导入了Import.m文件

2. 其他可能项目中存在两个一样的文件