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| 1 | +// |
| 2 | +// ContentView.swift |
| 3 | +// Shared |
| 4 | +// |
| 5 | +// Created by Igor Shelopaev on 09.06.2022. |
| 6 | +// The link to the code is under the video |
| 7 | +// |
| 8 | + |
| 9 | + |
| 10 | +import SwiftUI |
| 11 | + |
| 12 | +//experimenting with nav link |
| 13 | +struct ContentView: View { |
| 14 | + |
| 15 | + @State var route : Router = .empty |
| 16 | + |
| 17 | + var body: some View { |
| 18 | + NavigationView{ |
| 19 | + VStack{ |
| 20 | + Button("go1") { route = .go1} |
| 21 | + Button("go2") { route = .go2} |
| 22 | + Button("go3") { route = .go3} |
| 23 | + }.navigation(route: $route) |
| 24 | + }.navigationViewStyle(.stack) |
| 25 | + } |
| 26 | +} |
| 27 | + |
| 28 | +extension View{ |
| 29 | + @ViewBuilder |
| 30 | + func navigation(route : Binding<Router>) -> some View{ |
| 31 | + if route.wrappedValue != .empty{ |
| 32 | + modifier(NavigationModifire(route: route)) |
| 33 | + }else { self } |
| 34 | + } |
| 35 | +} |
| 36 | + |
| 37 | +// MARK: - define view modifire |
| 38 | +struct NavigationModifire : ViewModifier{ |
| 39 | + |
| 40 | + @State var isActive : Bool = true |
| 41 | + |
| 42 | + @Binding var route : Router |
| 43 | + |
| 44 | + func body(content: Content) -> some View { |
| 45 | + content |
| 46 | + .background{ |
| 47 | + NavigationLink(destination : route.builder, isActive: $isActive ){ |
| 48 | + EmptyView() |
| 49 | + }.hidden() |
| 50 | + } |
| 51 | + .onChange(of: isActive){ |
| 52 | + if $0 == false { route = .empty } |
| 53 | + } |
| 54 | + } |
| 55 | + |
| 56 | +} |
| 57 | + |
| 58 | +// MARK: - Define routes |
| 59 | + |
| 60 | +enum Router { |
| 61 | + case go1 |
| 62 | + case go2 |
| 63 | + case go3 |
| 64 | + case empty |
| 65 | + |
| 66 | + @ViewBuilder |
| 67 | + var builder: some View { |
| 68 | + switch(self) { |
| 69 | + case .go1: SubView(text: "go1") |
| 70 | + case .go2: SubView(text: "go2") |
| 71 | + case .go3: SubView(text: "go3") |
| 72 | + default: EmptyView() |
| 73 | + } |
| 74 | + } |
| 75 | +} |
| 76 | + |
| 77 | +// MARK: - Define sub view |
| 78 | + |
| 79 | +struct SubView: View { |
| 80 | + |
| 81 | + let text: String |
| 82 | + |
| 83 | + var body: some View { |
| 84 | + Text("\(text)") |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | + |
| 89 | + |
| 90 | +struct ContentView_Previews: PreviewProvider { |
| 91 | + static var previews: some View { |
| 92 | + ContentView() |
| 93 | + } |
| 94 | +} |
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