Example of having a single mutable UIViewController loading different subviews at runtime in 2 different ways
Suppose you have two or more ViewControllers in your app which are very similar except for a couple of UIViews.
This code sample demonstrates two different ways of factoring a UIViewController in a XIB separate from your Storyboard, which can then load a different UIView depending on the segue which presents it.
Both examples are implemented in the same app, starting from ViewController.
MutatingViewController will load either CustomView1.xib or CustomView2.xib depending on the value of a property which can be set by prepareForSegue in ViewController
Mutant1ViewController and Mutant2ViewController both derive from BaseViewController and will load either CustomView1.xib or CustomView2.xib according to the value of their mutableViewNibName property.
This sample was greatly facilitated by this blog post by Silvio Gutierrez.