SwiftUI some view to its root view

Question

I want to trigger the update of a subview in SwiftUI by changing the state of a @State variable, since it does not update alone when I change the Wallet Object since it is defined as EnvironmentObject. The thing is that I have to initialize the view with environmentObject, and it returns Some View, and cannot cast it to WalletView as it should seem that it should.

var walletView = WalletView().environmentObject(Wallet(cards: reminders)) if walletView = walletView as? WalletView{ walletView.isPresented = !walletView.isPresented }

How can I access the WalletView object?

I've tried:

var walletView = WalletView() let someWalletView = walletView.environmentObject(Wallet(cards: reminders)) walletView.isPresented = !walletView.isPresented

but the walletView doesn't seem to update. Any clue?

can you add the ContentView code to be clear, what you want to achieve? — Hrabovskyi Oleksandr
– Hrabovskyi Oleksandr, Commented Feb 21, 2020 at 2:59
"I want to trigger the update of a subview ... since it does not update alone when I change the Wallet Object since it is defined as EnvironmentObject." ??? it could be done ... you better to solve it, casting from some View is impossible by definition. — user3441734
– user3441734, Commented Feb 21, 2020 at 8:17

Asperi · Accepted Answer · 2020-02-21 03:45:57Z

The SwiftUI approach is to change view state inside view, so as far as I understood what your going to do with WalletView it could be achieved like in the following (scratchy):

struct WalletView: View { ... var body: some View { _some_internal_view .onAppear { self.isPresented = true } .onDisappear { self.isPresented = false } } }

Carles Estevadeordal · Accepted Answer · 2020-02-21 20:29:20Z

I've solved this by changing the variable isPresented to @Binding, and modifying it then triggers an update on the subclass.

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