How do I create resource packages with a filetype? NSBundles?

I am not sure what it is called, but I'm lo开发者_C百科oking for a way to create packages (a directory containing a bunch of non-executable files, i.e. images) with custom file extensions. For example, I want to create a theme package named example.theme, which contains a bunch of images. How can I achieve this?

Just create a directory with that name. On iOS, there is no file manager, so you don't have to worry about it appearing as a bundle or just as a regular directory.