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4 | 4 | ### Experimenting with navigation link. if you find this idea interesting you can expend it into more powerful solution. |
5 | 5 |
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6 | 6 |
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| 7 | +- The result navigaion definition |
| 8 | +```swift |
| 9 | + var body: some View { |
| 10 | + NavigationView{ |
| 11 | + VStack{ |
| 12 | + Button("go1") { route = .go1} |
| 13 | + Button("go2") { route = .go2} |
| 14 | + Button("go3") { route = .go3} |
| 15 | + }.navigation(route: $route) |
| 16 | + }.navigationViewStyle(.stack) |
| 17 | + } |
| 18 | +``` |
| 19 | + |
7 | 20 | - Define sub view |
| 21 | +```swift |
| 22 | +struct SubView: View { |
| 23 | + |
| 24 | + let text: String |
| 25 | + |
| 26 | + var body: some View { |
| 27 | + Text("\(text)") |
| 28 | + } |
| 29 | +} |
| 30 | +``` |
| 31 | + |
8 | 32 | - Define routes |
| 33 | +```swift |
| 34 | +enum Router { |
| 35 | + case go1 |
| 36 | + case go2 |
| 37 | + case go3 |
| 38 | + case empty |
| 39 | + |
| 40 | + @ViewBuilder |
| 41 | + var builder: some View { |
| 42 | + switch(self) { |
| 43 | + case .go1: SubView(text: "go1") |
| 44 | + case .go2: SubView(text: "go2") |
| 45 | + case .go3: SubView(text: "go3") |
| 46 | + default: EmptyView() |
| 47 | + } |
| 48 | + } |
| 49 | +} |
| 50 | +``` |
9 | 51 | - Define view modifire |
| 52 | +```swift |
| 53 | +struct NavigationModifire : ViewModifier{ |
| 54 | + |
| 55 | + @State var isActive : Bool = true |
| 56 | + |
| 57 | + @Binding var route : Router |
| 58 | + |
| 59 | + func body(content: Content) -> some View { |
| 60 | + content |
| 61 | + .background{ |
| 62 | + NavigationLink(destination : route.builder, isActive: $isActive ){ |
| 63 | + EmptyView() |
| 64 | + }.hidden() |
| 65 | + } |
| 66 | + .onChange(of: isActive){ |
| 67 | + if 0ドル == false { route = .empty } |
| 68 | + } |
| 69 | + } |
| 70 | + |
| 71 | +} |
| 72 | + |
| 73 | +extension View{ |
| 74 | + @ViewBuilder |
| 75 | + func navigation(route : Binding<Router>) -> some View{ |
| 76 | + if route.wrappedValue != .empty{ |
| 77 | + modifier(NavigationModifire(route: route)) |
| 78 | + }else { self } |
| 79 | + } |
| 80 | +} |
| 81 | +``` |
| 82 | + |
10 | 83 |
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11 | | -- Apply modifire |
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