SwiftUI: detecting when #State variable has change in their #Binding - ios

Question

I'm trying to figure how can change the value from different View. Here is the implementation of my main view:
import SwiftUI
import Combine
struct ContentView: View {
#State private var isPresented: Bool = false
#State private var textToProces = "" {
didSet{
print("text: oldValue=\(oldValue) newValue=\(textToProces)")
}
}
var body: some View {
ZStack{
VStack{
Button("Show Alert"){
self.isPresented = true
}.background(Color.blue)
}
ItemsAlertView(isShown: $isPresented, textToProcess: $textToProces)
}
}
}
On this view I'm trying to change the textToProces variable:
struct AnotherView: View {
#Binding var isShown: Bool
#Binding var textToProcess: String
var title: String = "Add Item"
let screenSize = UIScreen.main.bounds
var body: some View {
VStack {
Button(action: {
self.textToProcess = "New text"
self.isShown = false
}, label: {
Text("dissmis")
})
Text(self.textToProcess)
}
.background(Color.red)
.offset(y: isShown ? 0 : screenSize.height)
}
}
When I change the value on this line self.textToProcess = "New text" the textToProcess in the main view never gets the notification of the change. What I can I do to get the notification of the change in the main view any of you knows?
I'll really appreciate your help

Answer 1

You have to use the onChange modifier to track changes to textToProces.
import SwiftUI
import Combine
struct ContentView: View {
#State private var isPresented: Bool = false
#State private var textToProces = ""
var body: some View {
ZStack{
VStack{
Button("Show Alert"){
self.isPresented = true
}.background(Color.blue)
}
ItemsAlertView(isShown: $isPresented, textToProcess: $textToProces)
}
.onChange(of: textToProces) { value in
print("text: \(value)")
}
}
}