SwiftUI view state resetting after alert is shown

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Created 2h

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Seeing an issue in iOS 26.2 iPhone 17 simulator (haven't been able to reproduce on device or other simulators), where a view's state is reset after an alert is shown.

In this example the first LibraryView has the issue when alert is shown, the second LibraryView maintains state as expected.

struct ContentView: View {
    var body: some View {
        NavigationStack {
            List {
                VStack {
                    LibraryView(title: "Show view (Loss of state)")
                }
                
                LibraryView(title: "Show view (Works as expected)")
            }
        }
    }
}

/// This view is from a package dependency and wants to control the presentation of the sheet internally
public struct LibraryView: View {
    @State private var isPresented: Bool = false
    let title: String
    
    public init(title: String) {
        self.title = title
    }
    
    public var body: some View {
        Button(self.title) {
            self.isPresented = true
        }
        .sheet(isPresented: self.$isPresented) {
            ViewWithAlert()
        }
    }
}

private struct ViewWithAlert: View {
    @State private var isPresented: Bool = false
    @State private var presentedCount = 0
    
    var body: some View {
        Button("Show Alert, count: \(presentedCount)") {
            isPresented = true
            presentedCount += 1
        }
        .alert("Hello", isPresented: self.$isPresented) {
            Button("OK") { }
        }
    }
}

Any ideas?

The issue can be corrected by moving the .sheet to a higher level within the layout (i.e. on the NavigationStack). However, the library wants to control that presentation and not require the integration to present the sheet.

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Answer 1

DTS Engineer OP

Apple

2h

Thank you for sharing your post.

I find it intriguing, but I am unable to replicate the functionality you have described on my own devices. The code works the same in all simulators I have tried.

The parent SwiftUI view is a List, which is destroyed when nested view presentations and alerts are involved. While you mentioned that it works correctly on other simulators and devices, I have consistently encountered the same issue when running it on different simulators with the same configuration.

I would personally implement a custom mechanism to manage when and how the sheet is presented, potentially using a combination of state flags and conditional views to avoid relying on the immediate modifier behavior or better, do not include inside a List that will be destroyed.

I am still very interested in knowing what device and versions of iOS the code:

  List {
                VStack {
                    LibraryView(title: “Show view (Loss of state)”)
                } }

works so that I can investigate the reason, in my case, the state did not work in any simulator because the List was destroyed.

Thanks,

Albert Pascual   Worldwide Developer Relations.

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