Please delete this one!

Is it normal behaviour that when I apply a .toolbar to a Group that I see duplicate buttons equal to the number of Views in the Group? e.g. Group { Text("1") Text("2") Text("3") } .toolbar { Button("Hi") { } } Results in 3 toolbar buttons appearing in the UI, like in this screenshot: If not, then I'll submit feedback about this bug but thought I'd ask first. Xcode Version 16.0 beta 6 (16A5230g) iPhone 15 Pro Simulator

Could an Apple employee that works on SwiftUI please explain the update() func in the DynamicProperty protocol? The docs have ambiguous information, e.g. "Updates the underlying value of the stored value." and "SwiftUI calls this function before rendering a view’s body to ensure the view has the most recent value." From: https://developer.apple.com/documentation/swiftui/dynamicproperty/update() How can it both set the underlying value and get the most recent value? What does underlying value mean? What does stored value mean? E.g. Is the code below correct? struct MyProperty: DynamicProperty { var x = 0 mutating func update() { // get x from external storage x = storage.loadX() } } Or should it be: struct MyProperty: DynamicProperty { let x: Int init(x: Int) { self.x = x } func update() { // set x on external storage storage.save(x: x) } } This has always been a mystery to me because of the ambigious docs so thought it was time to post a question.

I gave the FocusCookbook sample project a try and FocusState is not working correctly on iOS 18. I understand the sample was originally designed for iOS 17 when it was released along side the WWDC 2023 talk The SwiftUI Cookbook for Focus. however I am suprised it no longer works on iOS 18. E.g. when I launch the app on iPhone 16 Pro simulator (Xcode 16.2, iOS 18.2 Simulator) and tap the grocery list nav bar button, the grocery sheet appears however the last entry text field is not focused like .defaultFocus is designed to do. Futhermore, if I tap the add (+) button and a new entry is added, despite the addEmptyItem() func setting the currentItemID which is the @FocusState var the focus does not change to the new text field. Is FocusState broken on iOS 18? Relevant code from GroceryListView.swift import SwiftUI struct GroceryListView: View { @Environment(\.dismiss) private var dismiss @Binding var list: GroceryList @FocusState private var currentItemID: GroceryList.Item.ID? var body: some View { List($list.items) { $item in HStack { Toggle("Obtained", isOn: $item.isObtained) TextField("Item Name", text: $item.name) .onSubmit { addEmptyItem() } .focused($currentItemID, equals: item.id) } } .toolbar { ToolbarItem(placement: .cancellationAction) { doneButton } ToolbarItem(placement: .primaryAction) { newItemButton } } .defaultFocus($currentItemID, list.items.last?.id) } // MARK: New item private func addEmptyItem() { let newItem = list.addItem() currentItemID = newItem.id } private var newItemButton: some View { Button { addEmptyItem() } label: { Label("New Item", systemImage: "plus") } } private var doneButton: some View { Button { dismiss() } label: { Text("Done") } } }

I noticed if I show a sheet from a List row, then remove the row the sheet isn't removed from the screen like it is if using VStack or LazyVStack. I'd be interested to know the reason why the sheet isn't removed from the screen in the code below. It only occurs with List/Form. VStack/LazyVStack gives the expected result. I was wondering if it is an implementation issue, e.g. since List is backed by UICollectionView maybe the cells can't be the presenter of the sheet for some reason. Launch on iPhone 16 Pro Simulator iOS 18.2 Tap "Show Button" Tap "Show Sheet" What is expected: The sheet should disappear after 5 seconds. And I don't mean it should dismiss, I just mean removed from the screen. Similarly if the View that showed the sheet was re-added and its show @State was still true, then the sheet would be added back to the screen instantly without presentation animation. What actually happens: Sheet remains on screen despite the row that presented the sheet being removed. Xcode 16.2 iOS Simulator 18.2. struct ContentView: View { @State var showButton = false var body: some View { Button("\(showButton ? "Hide" : "Show" ) Button") { showButton = true Task { try? await Task.sleep(for: .seconds(5)) self.showButton = false } } //LazyVStack { // does not have this problem List { if showButton { SheetButton() } } } } struct SheetButton: View { @State var sheet = false @State var counter = 0 var body: some View { Text(counter, format: .number) Button("\(sheet ? "Hide" : "Show") Sheet") { counter += 1 sheet.toggle() } .sheet(isPresented: $sheet) { Text("Wait... This should auto-hide in 5 secs. Does not with List but does with LazyVStack.") Button("Hide") { sheet = false } .presentationDetents([.fraction(0.3)]) } // .onDisappear { sheet = false } // workaround } } I can work around the problem with .onDisappear { sheet = false } but I would prefer the behaviour to be consistent across the container controls.