SwiftUI @State and .sheet() ios13 vs ios14

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Your code have expectation of view update/creation order, but in general it is undefined (and probably changed in iOS 14).

There is explicit way to pass information inside sheet – use different sheet creator, ie. .sheet(item:...

Here is working reliable example. Tested with Xcode 12 / iOS 14

struct ContentView: View {
    @State private var item: Item?

    struct Item: Identifiable {
        let id = UUID()
        var label: String = ""
    }

    var body: some View {
        VStack {
            Button(action: {
                self.item = Item(label: "A label")
            }) {
                Text("test")
            }
        }.sheet(item: $item, onDismiss: {
            self.item = nil
        }) {
            Text($0.label)
        }
    }
}

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