👀 Views: 64 💬 Answers: 1 📅 Created: 2025-06-11

SwiftUI UIScrollView iOS17 Swift

I'm having a hard time understanding I'm relatively new to this, so bear with me..... Hey everyone, I'm running into an issue that's driving me crazy. I'm currently working with a question where the `contentOffset` of a `UIScrollView` embedded within a `UIViewControllerRepresentable` isn't updating as expected in my SwiftUI app targeting iOS 17. I have integrated a `UIScrollView` to allow vertical scrolling of a grid of images, but when I attempt to programmatically set the `contentOffset` to scroll to a specific image, it does not move as intended. Here's a simplified version of my implementation: ```swift struct ImageGridView: UIViewControllerRepresentable { var images: [UIImage] var selectedIndex: Int func makeUIViewController(context: Context) -> GridViewController { let vc = GridViewController() return vc } func updateUIViewController(_ uiViewController: GridViewController, context: Context) { uiViewController.updateImages(images) let indexPath = IndexPath(item: selectedIndex, section: 0) uiViewController.scrollToImage(at: indexPath) } } class GridViewController: UIViewController { private var scrollView = UIScrollView() private var imageViews: [UIImageView] = [] override func viewDidLoad() { super.viewDidLoad() setupScrollView() } func setupScrollView() { scrollView.frame = view.bounds view.addSubview(scrollView) // Add image views to the scroll view here } func updateImages(_ images: [UIImage]) { // Assuming this method updates the imageViews array } func scrollToImage(at indexPath: IndexPath) { guard indexPath.item < imageViews.count else { return } let targetView = imageViews[indexPath.item] let targetOffset = CGPoint(x: targetView.frame.origin.x, y: targetView.frame.origin.y) scrollView.setContentOffset(targetOffset, animated: true) } } ``` The question arises when I call `scrollToImage(at:)` method inside the `updateUIViewController`. I expect the scroll view to animate to the specified index, but it remains at the top. I checked the frames of the image views and the calculated `targetOffset`, and they seem correct. I also tried wrapping the `setContentOffset` call in a `DispatchQueue.main.async` block to ensure the layout was complete before trying to scroll: ```swift DispatchQueue.main.async { self.scrollView.setContentOffset(targetOffset, animated: true) } ``` However, this did not resolve the scenario. I verified that the `contentSize` of the `UIScrollView` is being set correctly based on the number of images, but I still need to get the scroll view to move to the desired position. Has anyone encountered similar issues, or does anyone have suggestions on debugging this behavior? Thanks in advance! My development environment is Windows. Thanks in advance! This is part of a larger service I'm building.