Question

When Switching between two view controllers, what’s the difference between addSubView or using a navigation controller and using pushViewController?

In my app, I have a few set up screens in the beginning before a game calculator starts (which has a lot of view switching in between, and a lot of ViewControllers are reused).

In that case, should I set up a navigation controller in the AppDelegate or in the RootViewController, or just use addSubView in the first few set up screens and add a navigation controller where my calculator views start after the set up screens?

Answer 1

The difference is that with addSubiview, you add a view to another, which therefore will contain it. The navigation controller actually manages a stack of VC, in which the next view isn’t included in the previous.

Another diference is about parameters, addSubview will accept a view as argument, while the other will accept a view controller.

Typically, a navigation controller is used when displaying hierarchical content (in a table view most of the time), that allow the user to go deeper in details, or getting back to previous levels.