Oh yeah this is a great idea! Maybe it makes the most sense to open up some kind of g:xcode_scheme_source option that users can set to override the default value (which would be the workspace/project as it works now)? That seems like the most flexible way to tackle it.

If you have the time and want to take this on, I'd love to see a PR and would be more than happy to review/merge it!

I think this matches the current way of configuring the project well.
I'll add that.

I'd like to add g:xcode_ignore_pods where the workspace schemes subtracting Pods/Pods.xcodeproj schemes would be shown. What do you think of this option? I would suggest a default value of 0 to not change the current default behavior.

I think I'd like to avoid building in any CocoaPods specific knowledge here, honestly. Maybe a compromise would be like g:xcode_scheme_source_ignore which would let you specify projects/workspaces to ignore? Then in your vimrc you could do like:

let g:xcode_scheme_source_ignore = [
  \ "Pods/Pods.xcodeproj"
  \ ]

or whatever to filter out any cocoapods sources from any of your projects?

Love the ignore idea.

I've added the xcode_scheme_source_ignore. Unfortunately it is quite slow as it has to list schemes multiple times.

What do you think of g:xcode_prefer_projects which would result in ignoring any xcworkspace if there is a xcproject in the project root?
I think this would be the easiest solution (at least for me).

I've written a small plugin to source vim-files depending on the current project.
(Think of it as ftplugin/*.vim but using the cwd as project name)
Which fixes this issue for me.