SwiftUI: Clear Modal state or Reinitialize

Question

I have a SwiftUI modal that I would like to either clear the state of or reinitialize. Reinitalizing would be preferred considering the fact that this modal can open other modal

Answer 1

Update September 11th: This appears to be fixed in iOS 13 GM.

I've been struggling with the same thing and I would like to think that this is a bug that will be resolve by September, I've already filed it on Feedback Assistant, make sure to do the same!

For now though you can just create a new UIHostingController that wraps the SwiftUI View that you want to show modally. I know it looks really hacky but at least it works:

import SwiftUI

struct OtherView: View {
    @State var otherViewState: String = ""

    var body: some View {
        TextField($otherViewState, placeholder: Text("Demo Text Input"))
    }
}

struct Demo: View {
    var body: some View {
        Button("Toggle Modal") {
            self.showModal()
        }
    }

    func showModal() {
        let window = UIApplication.shared.windows.first
        window?.rootViewController?.present(UIHostingController(rootView: OtherView()), animated: true)
    }
}

You might want to improve how you get the window, specially if you support multiple windows but I think you get the idea.

Answer 2

You can reinitialize your Modal in .onAppear(). This example works on Beta 3.

import SwiftUI

struct ModalView : View {

    @Environment(\.isPresented) var isPresented: Binding<Bool>?

    @State var textName: String = ""

    var body: some View {

        NavigationView {

            Form {
                Section() {
                     TextField("Name", text: self.$textName)
                        .textFieldStyle(.roundedBorder)
                }
            }
            .listStyle(.grouped)
                .navigationBarTitle(Text("Add Name"), displayMode: .large)
                .navigationBarItems(leading: Button(action:{ self.dismiss() })
                { Text("Cancel") },
                                    trailing: Button(action:{ self.dismiss() })
                                    { Text("Save") } )
                .onAppear(perform: {
                    self.textName = ""
                })
        }
    }

    func dismiss() {
        self.isPresented?.value = false
    }

}

struct DetailView : View {

    var body: some View {

        PresentationLink(destination: ModalView())
        { Text("Present") }
    }

}

struct ContentView : View {

    var body: some View {

        NavigationView {
            NavigationLink(destination: DetailView())
            { Text("Navigate") }
        }
    }
}