I've been struggling with this issue since the release of macOS 15 Sequoia. I'm wondering if anyone else has encountered it or if anyone has a workaround to fix it.
Inserting a new element into the array that acts as data source for a SwiftUI List with a ForEach is never animated even if the insertion is wrapped in a withAnimation() call.
It seems that some other changes can be automated though: e.g. calls to shuffle() on the array successfully animate the changes.
This used to work fine on macOS 14, but stopped working on macOS 15.
I created a very simple project to reproduce the issue:
import SwiftUI
@main
struct TestApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct IdentifiableItem: Identifiable {
let id = UUID()
var name: String { "Item \(id)" }
}
struct ContentView: View {
@State var items: [IdentifiableItem] = [
IdentifiableItem(), IdentifiableItem(), IdentifiableItem(), IdentifiableItem(), IdentifiableItem(),
IdentifiableItem(), IdentifiableItem(), IdentifiableItem(), IdentifiableItem(), IdentifiableItem(),
]
var body: some View {
List {
ForEach(items) { item in
Text(item.name)
}
}
Button("Add Item") {
withAnimation {
items.insert(IdentifiableItem(), at: 0)
}
}
Button("Shuffle Items") {
withAnimation {
items.shuffle()
}
}
}
}
How to reproduce
Copy the code below in an Xcode project.
Run it on macOS 15.
Hit the "Add Item" button
Expected: A new item is inserted with animation.
Result: A new item is inserted without animation.
How to prove this is a regression
Follow the same steps above but run on macOS 14.
A new item is inserted with animation.
daniel-barros
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