Since you mentioned a segue, I assume that you are using storyboard, yes?
For storyboards, the setting to enable or disable autolayout applies to the entire board. You could instead use two storyboards and have a different setting for each, but then you can't use segues but would need to instantiate your viewcontrollers in code.
Having said that, just because you have autolayout enabled, doesn't mean that you have to use constraints in each view. By default, views have setTranslatesAutoresizingMaskIntoConstraints
enabled, which means that you can use frames for the most part.