import < Foundation/Foundation.h>
"could not build module 'Foundation'
需要在Apple LLVM 9.0 - Language - Modules, 应该设置 Enable Modules (C and Objective C) 为No
"could not build module 'Foundation'
需要在Apple LLVM 9.0 - Language - Modules, 应该设置 Enable Modules (C and Objective C) 为No