How to change NavigationView's destination in SwiftUI? - ios

Question

The need is to go to View1 by default and when onLongPressGesture to View2. #State is used to make it. And the code is as following:
#State var showingView2 = false
if self.showingView2 {
NavigationLink(destination: View2())
{ Cell(name: View2.name)
.onLongPressGesture(minimumDuration: 1) {
self.showingView2 = true
}
}
} else {
NavigationLink(destination: View1())
{ Cell(name: View1.name)
.onLongPressGesture(minimumDuration: 1) {
self.showingView2 = true
}
}
}
For the simplicity, new button cannot be added in the UI. I know the code cannot run, but I do not know how to fix it.
Any suggestion will help me. Thanks!
=========================================
Updated
Thanks for #Asperi!
But in my project there is ForEach in NavigationView, in which case the answer does not work. The code is following:
import SwiftUI
struct ContentView: View {
#State private var isLongPressed = false
let lyrics = ["a", "b", "c"]
var body: some View {
NavigationView {
List() {
ForEach(0..<lyrics.count) { (index) in
NavigationLink(destination:
Group {
if self.isLongPressed { Destination2() }
else { Destination1() }
})
{ Text(self.lyrics[index]) }
.simultaneousGesture(LongPressGesture(minimumDuration: 1).onEnded { flag in
self.isLongPressed.toggle()
})
}
}
}
}
}
struct Destination1: View {
var body: some View {
Text("Destination1")
}
}
struct Destination2: View {
var body: some View {
Text("Destination2")
}
}
Then how to make it in this case? And I do not want to change the short tap or long tap's function, just short tap to View1 and long tap to View2. Thanks!

Answer 1

Here is a demo of possible approach. Tested with Xcode 11.4 / iOS 13.4
struct TestAlternateDestinations: View {
#State private var isLongPressed = false
var body: some View {
NavigationView {
NavigationLink(destination: Group {
if isLongPressed { Destination2() }
else { Destination1() }}) {
Text(self.isLongPressed ? "Link2" : "Link1")
}
.simultaneousGesture(LongPressGesture(minimumDuration: 1).onEnded { flag in
self.isLongPressed.toggle()
})
}
}
}
struct Destination1: View {
var body: some View {
Text("Destination1")
}
}
struct Destination2: View {
var body: some View {
Text("Destination2")
}
}

Answer 2

Here is the final answer based on #Asperi.
And there is still a little bug. If not add many space in the NavigationLink's name, the long tap only work when you tap on the "a" "b" "c". On other space of the NavigationLink out of the "a" "b" "c", all tap is short tap.
import SwiftUI
struct ContentView: View {
#State private var isLongPressed = false
#State var currentTag: Int?
let lyrics = ["a", "b", "c"]
var body: some View {
NavigationView {
List {
ForEach(0..<lyrics.count) { index in
VStack{
HStack(alignment: .top) {
NavigationLink(destination: Group
{ if self.isLongPressed { Destination2() } else { Destination1() } }, tag: index, selection: self.$currentTag
) {
// This is still a little bug. If not add many space, the long tap only work when you tap on the "a" "b" "c". On other space of the NavigationLink out of the "a" "b" "c", all tap is short tap.
Text(self.lyrics[index] + " ")
}
}
}.simultaneousGesture(LongPressGesture().onEnded { _ in
print("Got Long Press")
self.currentTag = index
self.isLongPressed = true
})
.simultaneousGesture(TapGesture().onEnded{
print("Got Tap")
self.currentTag = index
self.isLongPressed = false
})
.onAppear(){
self.isLongPressed = false
}
}
}
}
}
}
struct Destination1: View {
var body: some View {
Text("Destination1")
}
}
struct Destination2: View {
var body: some View {
Text("Destination2")
}
}