CODEWITHSUNDEEP
swiftmacosswiftui
davidev
davidev

Reputation: 8547

SwiftUI MacOS using ObservableObject to update State

I am having a State in SwiftUI Mac OS, which stores my active selection of a Navigation View. Everything is working with the Navigation view.

Now I have created a new class which confirms to the Observable Object. In some child views I will make a change to that object. When the change is done, my Navigation view updated the object aswell, which is the feature of Observable Object as far as I understand.

What I now want to achieve is that the Observable object changes my @State in my Navigation view.

That is my declaration in my Navigation view. UserData stores a int aswell, which should be set to the selection on change.

@EnvironmentObject var userData: UserData

@State var selection: Int?

So userData.active = 2, should set selection = 2 aswell. Is there a onChange event I can trigger?

I am using that @State selection for a Binding in my Navigation Link.

NavigationLink(destination: SecondContentView(), tag: 0, selection: self.$selection)
{

Second approach, would be using that userData.active : Int directly as State. However, I am passing that selection State as Binding and it gives me an error when passing the variable of an EnvironmentObject as Binding.

Upvotes: 1

Views: 432

Answers (1)

Asperi
Asperi

Reputation: 258461

Try to use UserData directly, like 

NavigationLink(destination: SecondContentView(), tag: 0, 
    selection: self.$userData.active)

Upvotes: 1

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