The best replacement for xib is storyboard.

The best alternatives to xib are rated as following:
★★★★★  storyboard
★★★★★  nib file
★★★  nib

Your alternative for xib is not listed? Suggest!
Speaking about xib, one probably shouldn't forget about navigation controller.

Other search terms related to xib and their ratings are:
★★★★★ navigation controller
★★★ viewcontroller
★★ storyboard
★ view controller
You have in mind a companion for xib and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of xib in all years. Click on graph for more.
xib
storyboard
nib file