Hi, I'm new to software development and facing a problem that don't know how to solve. I have a piece of code using .backgroundPreferenceValue and .anchorPreference modifiers to monitor a button's position while dragging. It works perfectly on preview, simulator, and my own device if I download it through a cable connected to my computer. However, today I distributed it to TestFlight and found out it broke. I repeated the process serval times but the result is still the same. Has anybody run into the same type of problem before? Desperately need help. Many many thanks!

I'm using .onMove on a list for reordering. SwiftUI automatically applies shadow around the selected row which is great. My question is: Is there a way to make the shadow around the content in that row, in my case, a rounded rectangle, instead of around the whole list row container? import SwiftUI struct ContentView: View { var body: some View { List { ForEach(0...5, id: \.self) { index in ZStack { RoundedRectangle(cornerRadius: 20).fill(.yellow) Text("Row: \(index)").padding() }.padding() } .onMove {_,_ in } } .listStyle(.plain) } } #Preview { ContentView() }

Related Post: Keep ScrollView position when adding items on the top I was trying to implement a message view using ScrollView + LazyVStack. This view requires pagination so I used onScrollTargeVisibilityChange modifier to detect if the first item appears on screen and a new page needs to be loaded. I learnt from the above post that scrollPositon modifier can help keep the scroll position. I tested the method mentioned in that post -- use a button to add new items to the top -- and it worked. However, when use onScrollTargeVisibilityChange modifier to add items, the view automatically scrolls to the top and cause the following loop: first item in the list appears on screen --> load and insert more items to the top --> scroll view scrolls to top --> first item appears --> load more data --> scroll to top --> first item ... --> more data... --> top ... Until it generates the error ScrollTargetVisibilityChange tried to update multiple times per frame. Here is the simplified code. struct Item: Identifiable { var id: UUID = .init() var content: String } struct ScrollViewTest: View { @State private var items: [Item] = (0...30).map {Item(content:"\($0)")}.reversed() @State private var itemID: Item.ID? @State private var page: Int = 0 var body: some View { ScrollView { LazyVStack { ForEach(items) {item in Text(item.content) .frame(height: 30) } } .scrollTargetLayout() } .scrollPosition(id: $itemID) .defaultScrollAnchor(.bottom) .onScrollTargetVisibilityChange(idType: Item.ID.self) { onScreenItemIDs in if onScreenItemIDs.first == items.first?.id { page += 1 let newItems = (page*30+1 ... (page+1)*30).map {Item(content:"\($0)")} items.insert(contentsOf: newItems.reversed(), at: 0) } } .toolbar { Button("Add") { page += 1 let newItems = (page*30+1 ... (page+1)*30).map {Item(content:"\($0)")} items.insert(contentsOf: newItems.reversed(), at: 0) } } } } I want to load data while scrolling without the need of pressing any buttons. How can I solve this problem?