xcode终于找到如何对单个文件进行编译了

The command has been moved to the Perform Action submenu. Look under

Product > Perform Action > Compile filename.cpp

To assign Cmd+K to it, go to

File > Preferences > Key Bindings > Product Menu group

and you'll find Compile File where you can assign a key. Cmd+K is assigned to Clear Console now by default, so be sure to remove that binding to avoid conflicts.

但有个条件： xcode必须不是在indexing Text各个文件