The Apple LLVM 9.0 Language cannot be found in Xcode-target-build Setings. Figure

The project is new. After searching for a long time, I found that I should first look in all, find the Prefix Header and then add the PCH path. In this way, I can see the Apple LLVM 9.0 Language in Basic
The PCH path is wrong. Changed a few times the path, there is a comparison, feel the path is correct ah, can be an error, and then carefully look at the path was found to be more than a space, the path is copied down on the Internet, he revised the next, did not pay too much attention. The diagram below.