I have a class I use as EnvironmentObject with a screen
variable I want to use to control what screen the user is in. I use network calls to change this value, expiration seconds to move to another view, so I need my NavigationView to move to the adequate screen when this value changes.
For the class I have something like this:
class MyClass: NSObject, ObservableObject {
@Published var screen: String? = "main"
}
And for the main view I have something like this:
struct ContentView: View {
@EnvironmentObject var myClass: MyClass
var body: some View {
ZStack {
NavigationView() {
NavigationLink(destination: MainView(), tag: "main", selection: self.$myClass.screen)
{
EmptyView()
}
}
}
}
}
I don't seem to be able to work this way.
As a workaround I have done:
struct ContentView: View {
@EnvironmentObject var myClass: MyClass
var body: some View {
VStack {
if (self.myClass.screen == "main") {
MainView()
} else if (self.myClass.screen == "detail") {
DetailView()
}
}
}
But as you see, is not pretty. And I don't get any animations when changing screens.
Does anyone have an idea how to do this or how should I approach this situation?
Your second approach is correct. You just need animations. Unfortunately they only work when changing @State
variables.
For this you need to create a new @State
variable and assign it in .onReceive
:
struct ContentView: View {
@EnvironmentObject var myClass: MyClass
@State var screen: String?
var body: some View {
VStack {
if screen == "main" {
MainView()
} else if screen == "detail" {
DetailView()
}
}
.onReceive(myClass.$screen) { screen in
withAnimation {
self.screen = screen
}
}
}
}
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