You can take either approach. I opted to do it in code[0] as a personal preference since it reduced the amount of time spent jumping between Xcode and Vim, but creating a xib or storyboard and referencing it from Rust using NSBundle resources is just as possible. Maybe I should add examples of using resources to the code samples in the blog post. Thanks!

0: https://github.com/kattrali/webkitten/blob/6ac4ced187b44fe91...