A custom NSStoryboardSegue to make a nice iOS-like push transition.
This only works on OS X 10.10 and later, only in projects with storyboards. If you're targeting earlier versions you can use GRNavigationController.
Just set your segue type to "custom" and set the class to GRPushSegue, see the included demo project.
You can contribute with code, just send me a pull request, or open an issue for any bug/enhancement. Please try to code in a similar way to the code that's already been written.
Disclaimer: sending a pull request does not mean I will accept It, if I don't accept your pull request It doesn't mean I don't love you ;)