What is the process for utilizing @FocusState in conjunction with view models?

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The @FocusState property wrapper is used in SwiftUI to track the focused state of a view. It can be used in conjunction with view models to store and set the focus state of a particular view. Here is the process for utilizing @FocusState with view models:

1. Declare a property in your view model that will store the focus state value.

@FocusState private var isFocused: Bool

1. Add a binding to the view model property in your view.

TextField("Username", text: $username)
    .focused($viewModel.isFocused)

1. Use the @FocusState property wrapper to set and retrieve the focused state of the view.

@FocusState private var isFocused: Bool

var body: some View {
    TextField("Username", text: $username)
        .focused($isFocused)
}

1. You can then use the view model property to perform any necessary actions when the view gains or loses focus.

@FocusState private var isFocused: Bool

func onFocusChange() {
    if isFocused {
        // Perform some action when the view gains focus
    } else {
        // Perform some action when the view loses focus
    }
}

TextField("Username", text: $username)
    .onChange(of: isFocused) { isFocused in
        onFocusChange()
    }
    .focused($isFocused)