SwiftUI: How to handle nested scroll views with state management on iPhone 12?
I'm attempting to set up I tried several approaches but none seem to work... Hey everyone, I'm running into an issue that's driving me crazy. I'm working on a personal project and I'm currently facing a challenge with managing state in a SwiftUI application that involves nested scroll views. I'm trying to implement a layout where I have a vertical scroll view containing several horizontal scroll views, each displaying a list of items. The problem arises when I try to maintain the scrolling position of the horizontal scroll views while also updating other state variables based on user interactions. I have tried using `@State` and `@Binding` to manage the state, but I keep getting unexpected behavior where the horizontal scroll views reset their positions when the parent vertical scroll view is scrolled. Here’s a simplified version of what I have so far: ```swift struct ContentView: View { @State private var selectedItem: Int? = nil @State private var scrollPositions: [Int: CGFloat] = [:] var body: some View { ScrollView { ForEach(0..<5) { index in VStack { Text("Section \(index)") HorizontalScrollView(index: index, selectedItem: $selectedItem, scrollPosition: $scrollPositions) } } } } } struct HorizontalScrollView: View { let index: Int @Binding var selectedItem: Int? @Binding var scrollPosition: [Int: CGFloat] var body: some View { ScrollView(.horizontal) { HStack { ForEach(0..<10) { item in Button("Item \(item)") { selectedItem = item } } }.onAppear { // Restore scroll position for this index // Problem: scrollPositions[index] is not behaving as expected } } } } ``` When I scroll up and down, the horizontal scroll views reset to the beginning instead of retaining their positions. I’ve tried using `GeometryReader` to track the scroll position, but it feels quite clunky and doesn't seem to reliably retain the scroll state. I also get warnings in the console, such as `Modifying state during view update` when I try to set scroll positions within the view body. How can I structure my state management to avoid these issues and ensure that each horizontal scroll view can maintain its position independently, even when the overall vertical scroll view is scrolled? Any insights or best practices on handling this scenario would be greatly appreciated! I'm working on a application that needs to handle this. Has anyone else encountered this? I'd really appreciate any guidance on this. Has anyone else encountered this?