XcodeSFF is a project mainly written in Objective-C, based on the BSD-3-Clause license.
an xcodeplugin that brings back the Single File Find window in place of the inline "incremental" find bar (as apple refers to it in code). The resulting pbplugin goes into ~/Library/Application Support/Developer/Shared/Xcode/Plug-in
You don't like the new find bar?
Get back the find window!
~/Library/Application Support/Developer/Shared/Xcode/Plug-ins
After installing the plugin, you may have to manually set the ⌘F shortcut once in Xcode preferences > Key Bindings > Menu Key Bindings > Edit > Find > Find…