SwitUI - Two navigationLink in a list - ios

Question

I have two NavigationLink in a cell of my List
I want to go to destination1 when I tap once,and go to destination2 when I tap twice.
So I added two tap gesture to control the navigation.
But when I tap,there are two questions:
1 The tap gesture block won't be called.
2 The two navigation link will be both activated automatically even if they are behind a TextView.
The real effect is: Tap the cell -> go to Destination1-> back to home -> go to Destination2 -> back to home
Here is my code :
struct MultiNavLink: View {
#State var mb_isActive1 = false;
#State var mb_isActive2 = false;
var body: some View {
return
NavigationView {
List {
ZStack {
NavigationLink("", destination: Text("Destination1"), isActive: $mb_isActive1)
NavigationLink("", destination: Text("Destination2"), isActive: $mb_isActive2)
Text("Single tap::go to destination1\nDouble tap,go to destination2")
}
.onTapGesture(count: 2, perform: {()->Void in
NSLog("Double tap::to destination2")
self.mb_isActive2 = true
}).onTapGesture(count: 1, perform: {()->Void in
NSLog("Single tap::to destination1")
self.mb_isActive1 = true
})
}.navigationBarTitle("MultiNavLink",displayMode: .inline)
}
}
}
I have tried remove the List element,then everything goes as I expected.
It seems to be the List element that makes everything strange.
I found this question:SwiftUI - Two buttons in a List,but the situation is different from me.
I am expecting for your answer,thank you very much...

Answer 1

Try the following approach - the idea is to hide links in background of visible content and make them inactive for UI, but activated programmatically.
Tested with Xcode 12 / iOS 14.
struct MultiNavLink: View {
var body: some View {
return
NavigationView {
List {
OneRowView()
}.navigationBarTitle("MultiNavLink", displayMode: .inline)
}
}
}
struct OneRowView: View {
#State var mb_isActive1 = false
#State var mb_isActive2 = false
var body: some View {
ZStack {
Text("Single tap::go to destination1\nDouble tap,go to destination2")
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.contentShape(Rectangle())
.background(Group {
NavigationLink(destination: Text("Destination1"), isActive: $mb_isActive1) {
EmptyView() }
.buttonStyle(PlainButtonStyle())
NavigationLink(destination: Text("Destination2"), isActive: $mb_isActive2) {
EmptyView() }
.buttonStyle(PlainButtonStyle())
}.disabled(true))
.highPriorityGesture(TapGesture(count: 2).onEnded {
self.mb_isActive2 = true
})
.onTapGesture(count: 1) {
self.mb_isActive1 = true
}
}
}

Answer 2

Navigation link has a initializer that takes a binding selection and whenever that selection is set to the value of the NavigationLink tag, the navigation link will trigger.
As a tip, if the app can't differentiate and identify your taps, and even with two taps, still the action for one-tap will be triggered, then you can use a simultaneous gesture(.simultaneousGesture()) modifier instead of a normal gesture(.gesture()) modifier.
struct someViewName: View {
#State var navigationLinkTriggererForTheFirstOne: Bool? = nil
#State var navigationLinkTriggererForTheSecondOne: Bool? = nil
var body: some View {
VStack {
NavigationLink(destination: SomeDestinationView(),
tag: true,
selection: $navigationLinkTriggererForTheFirstOne) {
EmptyView()
}
NavigationLink(destination: AnotherDestinationView(),
tag: true,
selection: $navigationLinkTriggererForTheSecondOne) {
EmptyView()
}
NavigationView {
Button("tap once to trigger the first navigation link.\ntap twice to trigger the second navigation link.") {
// tap once
self.navigationLinkTriggererForTheFirstOne = true
}
.simultaneousGesture(
TapGesture(count: 2)
.onEnded { _ in
self.navigationLinkTriggererForTheSecondOne = true
}
)
}
}
}
}