uitraitcollection Questions

Should I use viewDidLayoutSubviews() or traitCollectionDidChange() to respond to changes in interface orientation – Ios swift

April 26, 2023
michael.yql
3 Answers

I'm trying to update the constraints and change the layout of my subviews when the user rotates their device. From what I understand, both viewDidLayoutSubviews() and traitCollectionDidChange() are able to respond to changes in the interface orientation (e.g. when the…

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Why is traitCollectionDidChange not called for a table view cell when content size category changes? – Ios swift

January 4, 2022
Brian Spilner
2 Answers

I have a view controller that contains a table view and displays custom cells. I'm trying to react to a content size category change using the traitCollectionDidChange method (within the cell subclass), but this method is never called for the…

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Xcode 13 beta 5 error: UIViewController is missing its initial trait collection populated during initialization

September 7, 2021
Aggressor
2 Answers

App was working fine until Xcode 13 beta 5 builds. Suddenly get this error in this init line of code in our view controller: init(dataProvider: DataProvider) { self.dataProvider = dataProvider super.init(style: .plain) dataProvider.delegate = self } This code was working…

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