UIScrollView is between pages after device rotation

Question

Created Dec ’15

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I've got a UIScrollView with paging enabled, with 2 pages. I'm using auto layout. When I rotate from portraint to landscape, the content offset of the scroll view ends up between pages. Is that normal, or is there something else in my app screwing it up? Is there a simple way to change the behavior, so it sticks to a page on rotation?

thanks, Rob

Answered by Frameworks Engineer in 95881022

Yes. Your app needs to reset the content offset of the scroll view to be a multiple of the new page width whenever the scroll view's size changes (e.g. in response to device rotation). The PageControl sample shows an example of this (in Classes/iPhone/RootViewController.m).

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Answer 1

Frameworks Engineer OP

Apple

Dec ’15

Accepted Answer

Yes. Your app needs to reset the content offset of the scroll view to be a multiple of the new page width whenever the scroll view's size changes (e.g. in response to device rotation). The PageControl sample shows an example of this (in Classes/iPhone/RootViewController.m).

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Answer 2

rnikander OP

Dec ’15

Great, thanks for the help!

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Answer 3

klaas OP

May ’18

The example is now updated for Swift.

In

func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)

super is called twice. Is this a mistake or on purpose?

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