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Editorial Team
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Asked: 2026-06-06T09:56:40+00:00

I have an application where I’m trying to pass a UIScrollView from one UIViewController

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I have an application where I’m trying to pass a UIScrollView from one UIViewController to the next during a navigation transition. I’m trying to figure out in which methods I should make remove the UIScrollView from its superview and then attach it to the new UIViewController.

I did an NSLog in the viewDiDisappear / viewWillDisappear methods of the first UIViewController and the viewDidAppear / viewWillAppear methods of the second UIViewController and this is the order I got:

viewWillDisappear
viewWillAppear
viewDidDisappear
viewDidAppear

My question is, can I expect this to stay consistent for all transitions, or do these run on different threads and based on load times of certain things, can they vary?

EDIT: Bump

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1 Answer

  1. Editorial Team

    Actually, when you try to add a view as a subview, and it already has a superview, it will be removed from its original superview before being added to the new superview (as per the docs: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html)… so don’t really even have to worry about this as much as I thought.

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