👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-11

ios uiviewcontroller uiscrollview autolayout swift

I'm working with a question where my `UIScrollView` content is not scrolling as expected because the `contentSize` doesn't seem to update correctly when using Auto Layout. I have a simple `UIViewController` with a `UIScrollView` containing a vertically stacked `UIStackView` that holds several `UILabel` elements. Although I set the constraints properly, the scroll view doesn't reflect the actual content size when the labels are dynamically loaded. Here's the relevant code snippet: ```swift class MyViewController: UIViewController { @IBOutlet weak var scrollView: UIScrollView! @IBOutlet weak var stackView: UIStackView! override func viewDidLoad() { super.viewDidLoad() loadContent() } func loadContent() { for i in 1...20 { let label = UILabel() label.text = "Label \(i)" label.numberOfLines = 0 stackView.addArrangedSubview(label) } // This is where it seems not to update correctly scrollView.contentSize = stackView.bounds.size } } ``` I've tried calling `layoutIfNeeded()` on the `stackView` and the `scrollView` after adding the labels, but that didn't seem to fix the question. I also checked whether the `UIScrollView` is properly constrained to the view, and it is. Here's what I see in the debug console: ``` Warning: Attempt to set contentSize on UIScrollView before it has a frame. ``` I suspect that the scenario might be with the timing of when the `contentSize` is being set, but I'm not entirely sure how to handle it properly in this context. Has anyone faced a similar scenario or knows how to ensure that the `UIScrollView` scrolls correctly when using Auto Layout in iOS 17? The stack includes Swift and several other technologies. Any examples would be super helpful.