Swift implementation of CoreGTK generator https://github.com/coregtk/coregtkgen
CoreGTKGen is a utility that generates pure Swift language bindings for CoreGTK using GObject Introspection. CoreGTKGen is free software, licensed under the GNU LGPL.
coregtkgen-swift </path/to/Gtk-3.0.gir> </path/to/Config/dir> </path/to/output>