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SwiftUI Dismiss Multiple Modal Sheets

Tags:

ios

swift

swiftui

I am using .sheet(isPresented: self.$showModal) in my root view to present a modal. Within the modal, I am using NavigationView to take the user through various pages (for a user profile builder).

In the last page of my navigation stack, I am using @Environment(\.presentationMode) var presentationMode and a button which calls self.presentationMode.wrappedValue.dismiss() to dismiss the modal. However, this only dismisses the last page in the navigation stack, and I just end up at the previous page. What I want to do is dismiss the entire navigation stack and end up back at the root view.

Swiping down to dismiss the modal produces the desired result, but I want to do this programatically with the button.

Is this currently possible in SwiftUI, or is this a problem with using NavigationView within a modal sheet?

like image 394
lmh Avatar asked Oct 09 '19 05:10

lmh


2 Answers

Solution 1 - Custom EnvironmentKey

A possible solution is to use a custom EnvironmentKey injected to every environment:

struct PresentationKey: EnvironmentKey {
    static let defaultValue: [Binding<Bool>] = []
}

extension EnvironmentValues {
    var presentations: [Binding<Bool>] {
        get { return self[PresentationKey] }
        set { self[PresentationKey] = newValue }
    }
}

Demo:

enter image description here

struct ContentView: View {
    @Environment(\.presentations) private var presentations
    @State private var showSheet = false

    var body: some View {
        Button("Show sheet") {
            showSheet = true
        }
        .sheet(isPresented: $showSheet) {
            SheetView()
                .environment(\.presentations, presentations + [$showSheet])
        }
    }
}
struct SheetView: View {
    @Environment(\.presentations) private var presentations
    @State private var showSheet = false

    var body: some View {
        Button("Show another sheet") {
            showSheet = true
        }
        .sheet(isPresented: $showSheet) {
            SheetNavigationView()
                .environment(\.presentations, presentations + [$showSheet])
        }
    }
}
struct SheetNavigationView: View {
    var body: some View {
        NavigationView {
            NavigationLink("Link", destination: SheetNavigationDetailView())
        }
    }
}
struct SheetNavigationDetailView: View {
    @Environment(\.presentations) private var presentations

    var body: some View {
        Button("Pop to root") {
            presentations.forEach {
                $0.wrappedValue = false
            }
        }
    }
}

Solution 2 - Dismiss UIKit rootViewController

struct SheetNavigationDetailView: View {

    var body: some View {
        Button("Pop to root") {
            UIApplication.shared.windows.first?.rootViewController?.dismiss(animated: true)
        }
    }
}
like image 166
pawello2222 Avatar answered Oct 23 '22 05:10

pawello2222


You can pass showModal as a binding into the following screens and instead of using presentationValue set showModal to false.

like image 4
LuLuGaGa Avatar answered Oct 23 '22 03:10

LuLuGaGa