Comments (2)
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 functionperformBackgroundActivities()
is doing, would it be same if you just calledDispatchQueue.main.async { self.navigationStack.push(ChildView()) }
inside button's action?, can you explain this more? or do we have to implementViewModel
logic ourselvesstruct 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.
from swiftui-navigation-stack.
Related Issues (20)
- Stack Reset / Jump to a completely different view HOT 2
- Transition animation not working HOT 1
- @State variables get reset after pop HOT 3
- Support for iOS 15. HOT 1
- Push doesn't work if app is backgrounded and aware of scenePhase
- Return to the same position in the previous view HOT 2
- Support for Xcode 14 and new SwiftUI API HOT 6
- Previous view completely reloaded after pop HOT 1
- Popping to a specific view
- Callback navigation sometimes doesnt work HOT 1
- iOS 16 transitions malfunctioning HOT 9
- after pop,the previous scrollview auto scroll to top? HOT 6
- Xcode 14 Compiling Issue HOT 6
- not support swipe back HOT 2
- Referencing @Environment(\.scenePhase) var scenePhase breaks navigation when moving app to background
- [Bug]: Clicking on any other window in macOS will return stack to its root
- Value not changed by @Binding
- onappear excuse only first time
- how use in List cell
- after pop,the previous scrollview auto scroll to top?
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