Fix the back swipe gesture not working correctly in SwiftUI. https://stackoverflow.com/a/58345554/3393964

Navigation.swift

/// Fixed swipe gesture NavigationLink
struct NavigationLink<Destination: View, Label:View>: View {
    var destination: Destination
    var label: () -> Label
    
    public init(destination: Destination, @ViewBuilder label: @escaping () -> Label) {
        self.destination = destination
        self.label = label
    }
    
    /// If this crashes, make sure you wrapped the NavigationLink in a NavigationView
    @EnvironmentObject private var nvc: NavigationViewUINavigationController
    
    var body: some View {
        Button(action: {
            let rootView = self.destination.environmentObject(self.nvc)
            let hosted = UIHostingController(rootView: rootView)
            self.nvc.pushViewController(hosted, animated: true)
        }, label: label)
    }
}

/// Fixed swipe gesture NavigationView
struct NavigationView<Content: View>: UIViewControllerRepresentable {
    
    var content: () -> Content
    
    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
    }
    
    func makeUIViewController(context: Context) -> UINavigationController {
        let nvc = NavigationViewUINavigationController()
        let host = UIHostingController(rootView: content().environmentObject(nvc))
        nvc.viewControllers = [host]
        return nvc
    }
    
    func updateUIViewController(_ uiViewController: UINavigationController, context: Context) {}
}

/// Fileprivate type to not expose the navigation controller to all views
fileprivate class NavigationViewUINavigationController: UINavigationController, ObservableObject {}

zExample.swift

struct ContentView: View {
    @State var isPresented = false
    
    var body: some View {
        NavigationView {
            VStack(alignment: .center, spacing: 30) {
                NavigationLink(destination: Text("Detail"), label: {
                    Text("Show detail")
                })
                Button(action: {
                    self.isPresented.toggle()
                }, label: {
                    Text("Show modal")
                })
            }
            .navigationBarTitle("SwiftUI")
        }
        .edgesIgnoringSafeArea(.top)
        .sheet(isPresented: $isPresented) {
            Modal()
        }
    }
}

struct Modal: View {
    @Environment(\.presentationMode) var presentationMode
    
    var body: some View {
        NavigationView {
            VStack(alignment: .center, spacing: 30) {
                NavigationLink(destination: Text("Detail"), label: {
                    Text("Show detail")
                })
                Button(action: {
                    self.presentationMode.wrappedValue.dismiss()
                }, label: {
                    Text("Dismiss modal")
                })
            }
            .navigationBarTitle("Modal")
        }
    }
}

This code works without overriding NavigationLink, NavigationView is enough. @Amzd