@ObservedObject var viewModel: ViewModel about swiftui-navigation-stack HOT 2 CLOSED

ViewModel comes with the MVVM pattern that you should use when using SwiftUI. A viewmodel contains all the data that need to be displayed in the view.
There are a lot of articles about that:

• https://learnappmaking.com/mvvm-swiftui-how-to/
• https://www.vadimbulavin.com/modern-mvvm-ios-app-architecture-with-combine-and-swiftui/

from swiftui-navigation-stack.

you have mentioned programmatic push/pop in the examples, but it's not clear how you implemented the ObservedObject var viewModel: ViewModel, and what it's purpose is, and what function performBackgroundActivities() is doing, would it be same if you just called DispatchQueue.main.async { self.navigationStack.push(ChildView()) } inside button's action?, can you explain this more? or do we have to implement ViewModel logic ourselves

struct MyHome: View {
    @ObservedObject var viewModel: ViewModel
    @EnvironmentObject private var navigationStack: NavigationStack

    var body: some View {
        Button(action: {
            self.viewModel.performBackgroundActivities(withCallback: {
                DispatchQueue.main.async {
                    self.navigationStack.push(ChildView())
                }
            })
        }, label: {
            Text("START BG ACTIVITY")
        })
    }
}

Hi @par400 in the README you can find a silly example about programmatic push. What I called viewModel in that example is just an object (relying on the MVVM pattern, as stated by @nosenergies) that contains some logic (for example the performBackgroundActivities , which is just an example). What is important is that you can programmatically push and pop by directly accessing the navigation stack environment object. In other words, you can rewrite the example this way:

struct MyHome: View {
    @EnvironmentObject private var navigationStack: NavigationStack

    var body: some View {
        Button(action: {
            self.navigationStack.push(ChildView())
        }, label: {
            Text("START BG ACTIVITY")
        })
    }
}

And it will work as expected.

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