Swiftui Why is background not working until second row is tapped - ios

Question

I have a share view controller attached to a list . When a user taps on a list row the ShareView is supposed to pop and display the contents of the list that was tapped . The issue is when I start the app and tap on a list item the ShareView text is blank, if I tap on a second different item the it shows the content:
// example : start the app, click List 1 and see that no content displays, then Click List 2 and content is displayed .
How can I make it so that the first time you tap a list the content is displayed in ShareView controller . This is the small project
import SwiftUI
struct ContentView: View {
let StringList = ["List 1","List 2","List 3","List 4","List 5"]
#State var TextExample = ""
#State var IsOpen = false
var body: some View {
List {
ForEach(StringList, id: \.self) { string in
Text(string)
.onTapGesture {
TextExample = string
IsOpen = true
}
}
}.background(SharingViewController(isPresenting: $IsOpen) {
print("\(TextExample)")
let av = UIActivityViewController(activityItems: [TextExample], applicationActivities: nil)
av.completionWithItemsHandler = { _, _, _, _ in
IsOpen = false // required for re-open !!!
}
return av
})
}
}
struct SharingViewController: UIViewControllerRepresentable {
#Binding var isPresenting: Bool
var content: () -> UIViewController
func makeUIViewController(context: Context) -> UIViewController {
UIViewController()
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
if isPresenting {
uiViewController.present(content(), animated: true, completion: nil)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Any suggestions would be great

Answer 1

Im not sure if this is an old bug, but I saw this before.
However, I found that using #StateObject class and its sub variable #Published to bind the data instead of local #State variable solved this problem.
Below is the working code which I tested. Also, here is the proof video link: https://drive.google.com/file/d/1ItlOf33vasO9WFRDokUq_PXLzUpR8UBa/view?usp=sharing
class VM : ObservableObject {
#Published var storedText = "" //added
}
struct ContentView: View {
#StateObject var viewModel = VM() //added
let StringList = ["List 1","List 2","List 3","List 4","List 5"]
#State var TextExample = ""
#State var IsOpen = false
var body: some View {
List {
ForEach(StringList, id: \.self) { string in
Text(string)
.onTapGesture {
viewModel.storedText = string //added
IsOpen = true
}
}
}.background(
SharingViewController(isPresenting: $IsOpen) {
print("\(viewModel.storedText)") //added
let av = UIActivityViewController(activityItems: [viewModel.storedText], applicationActivities: nil) //added
av.completionWithItemsHandler = { _, _, _, _ in
IsOpen = false // required for re-open !!!
}
return av
})
}
}
struct SharingViewController: UIViewControllerRepresentable {
#Binding var isPresenting: Bool
var content: () -> UIViewController
func makeUIViewController(context: Context) -> UIViewController {
UIViewController()
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
if isPresenting {
uiViewController.present(content(), animated: true, completion: nil)
}
}
}