---
title: "presentationPreventsAppTermination(_:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/view/presentationpreventsapptermination(_:)"
---

# presentationPreventsAppTermination(_:)

Whether a presentation prevents the app from being terminated/quit by the system or app termination menu item.

## Declaration

```swift
nonisolated func presentationPreventsAppTermination(_ prevents: Bool?) -> some View

```

## Discussion

Discussion SwiftUI uses the buttons in a sheet’s toolbar to determine whether a particular sheet should block termination by default. If there is a singular toolbar item with the confirmationAction or the cancellationAction placement and no other toolbar items, the sheet will not prevent termination by default. Use this modifier to specify whether a sheet should prevent app termination. Pass nil to explicitly request the automatic behavior/for the inert version of this modifier. Non-nil values will override nil, and true takes precedence over false. Use this modifier within the content argument to View/sheet struct LaunchScreen: View {   @State private var presentLogin = false   var body: some View {     HomeView()       .sheet(isPresented: $presentLogin) {         LoginView()           // explicitly allow app termination because the           // default behavior would resolve to `true`.           .presentationPreventsAppTermination(false)           .toolbar {             ToolbarItem(placement: .cancellationAction) {               Button("Cancel") { presentLogin = false }             }             ToolbarItem(placement: .confirmationAction) {               Button("Login") {                 // Attempt login...                 presentLogin = false               }             }           }         }     } }

## See Also

### Sheet and popover configuration

- [interactiveDismissDisabled(_:)](swiftui/view/interactivedismissdisabled(_:).md)
- [presentationDetents(_:)](swiftui/view/presentationdetents(_:).md)
- [presentationDetents(_:selection:)](swiftui/view/presentationdetents(_:selection:).md)
- [presentationDragIndicator(_:)](swiftui/view/presentationdragindicator(_:).md)
- [presentationBackground(_:)](swiftui/view/presentationbackground(_:).md)
- [presentationBackground(alignment:content:)](swiftui/view/presentationbackground(alignment:content:).md)
- [presentationBackgroundInteraction(_:)](swiftui/view/presentationbackgroundinteraction(_:).md)
- [presentationCompactAdaptation(horizontal:vertical:)](swiftui/view/presentationcompactadaptation(horizontal:vertical:).md)
- [presentationCompactAdaptation(_:)](swiftui/view/presentationcompactadaptation(_:).md)
- [presentationContentInteraction(_:)](swiftui/view/presentationcontentinteraction(_:).md)
- [presentationCornerRadius(_:)](swiftui/view/presentationcornerradius(_:).md)
- [presentationSizing(_:)](swiftui/view/presentationsizing(_:).md)
- [presentationBreakthroughEffect(_:)](swiftui/view/presentationbreakthrougheffect(_:).md)