Fatal error: Accessing State<Binding<String>> outside View.body - swiftui

Question

I'm having a problem trying to get textfields working in SwiftUI.
I get Fatal error: Accessing State> outside View.body whenever I try to run the following code.
Anyone have a suggestion?
struct SearchRoot : View {
#State var text: String = ""
var body: some View {
HStack {
TextField($text,
placeholder: Text("type something here..."))
Button(action: {
// Closure will be called once user taps your button
print(self.$text)
}) {
Text("SEND")
}
}
}
}
I'm running Xcode Version 11.0 beta (11M336w) on macOS 10.15 Beta (19A471t)
Edit: Simplified code, still getting the same error.
struct SearchRoot : View {
#State var text: String = ""
var body: some View {
TextField($text,
placeholder: Text("type something here..."))
}
}

Answer 1

The compiler emits an error if the $ operator is used outside body, in a View.
The button initializer is defined as:
init(action: #escaping () -> Void, #ViewBuilder label: () -> Label)
You're using $ in an escaping closure, in the first snippet of code.
That means the action may outlive (escape) the body, hence the error.
The second snippet compiles and works fine for me.

Answer 2

Eureka! SwiftUI wants a single source of truth.
What I neglected to include in my original code snippets is that this struct is within a tabbed application.
To fix this I needed to define the #State var text: String = "" in the struct that creates the top level TabbedView, then use $Binding in the SearchRoot.
I'm not sure if this is works as designed or just a beta 1 issue, but it's the way it works for now.
struct ContentView : View {
#State private var selection = 0
#State private var text: String = "searching ex"
var body: some View {
TabbedView(selection: $selection){
ShoppingListRoot().body.tabItemLabel(Text("Cart")).tag(0)
SearchRoot(text: $text).body.tabItemLabel(Text("Search")).tag(1)
StoreRoot().body.tabItemLabel(Text("Store")).tag(2)
BudgetRoot().body
.tabItemLabel(Text("Budget"))
.tag(3)
SettingsRoot().body
.tabItemLabel(Text("Settings"))
.tag(4)
}
}
}