Hand Code?
No, not at all? i think we're just on a different line.
If you have an UIImageView in Interface Builder, and you want to assign an image to it, (and you put in the imageString.png), you can't actually navigate through a "FileSystem Tree", like in other other IDE's, the only thing you can do. (unless someone can prove me wrong).
Red+1.png
Red-1.png
etc.
I do it different through code, I loop through a hardfolder with extensions.png. So then depending on the directory, I can change. but you want to stick to Interface Builder if you don't want to go there. Then you need to do like I said 🙂
Good luck.