About how to create a folder in Xcode. (Hope to add), new in xcode

About how to create a folder in Xcode. (Hope to add), new in xcode
1. for newly created classes, put them in the corresponding folder in the file directory. At this time, in Xcode, an error will be reported (the file path is incorrect). At this time, the file (RED: marked because the path is not found and the target is not found) will be deleted, then add the corresponding file. Note: The group created in Xcode does not adjust the file in the project file. 2. When creating a new class, select new folder in the lower left corner to put the new class in the corresponding folder, the purpose is to make the project structure clearer.