How to programmatically trigger NavigationLink? - swiftui

Question

I have a NavigationView with a bunch of NavigationLinks in it. When the user hits the "Add" button, I want to create a new item in the view and automatically send them to it. Can I do that?

Answer 1

SwiftUI triggers View changes (the body) when its source of truth changes, so you just need to change the Binding<Bool> value to trigger a view update. Store the bindings for each link, and change its value when you click a button.
Let's say you have three different views you want to push. Then you would have three different bindings to store. You can store these bindings as three separate #State properties, or using a #StateObject view model as follows:
class RootViewModel: ObservableObject {
#Published var isLinkActive:[Int: Bool] = [:]
}
struct RootView: View {
#StateObject var viewModel = RootViewModel()
...
func binding(index: Int) -> Binding<Bool> {
return .init(get: { () -> Bool in
return self.viewModel.isLinkActive[index, default: false]
}) { (value) in
self.viewModel.isLinkActive[index] = value
}
}
...
func destination(index: Int) -> some View {
switch index {
case 1:
return ContentViewOne()
case 2:
return ContentViewTwo()
case 3:
return ContentViewThree()
default:
return EmptyView()
}
}
var body: some View {
return
NavigationView {
VStack {
ForEach(1..<4) { index in
NavigationLink(destination: self.destination(index: index), isActive: self.binding(index: index)) {
Text("Link to Content View \(index)")
}
}
Button("Add") {
self.contentViewModel.isLinkActive[2] = true // Change this index depending on which view you want to push.
}
}
}
}
}
So the button here simulates the second NavigationLink tap. I used StateObject to stop redrawing the whole RootView in the middle of a push.