SwiftUI Preview not working with Binding<Bool> [duplicate] - swift

Question

I present this view as a sheet from its parent view
struct NamesView: View {
#Binding var match: Match
var body: some View {
...
}
}
Since the match source of truth is in the parent view presenting this NamesView sheet, when the view is constructed I pass in a $match binding and data flows as intended.
However, when constructing this view in a preview provider
struct NamesView_Previews: PreviewProvider {
static var previews: some View {
NamesView()
}
}
the compiler says that NamesView() expects a match argument of type Binding<Match> (Match being the parent view presenting this view as a sheet). I'm not sure what would be a good way to proceed from here or if this is a limitation of SwiftUI.

Answer 1

If you want only constant preview, then it can be
struct NamesView_Previews: PreviewProvider {
static var previews: some View {
NamesView(match: .constant(Match()))
}
}
if you want it in live, the it can be
struct NamesView_Previews: PreviewProvider {
struct BindingTestHolder: View {
#State private var testedMatch = Match()
var body: some View {
NamesView(match: $testedMatch)
}
}
static var previews: some View {
BindingTestHolder()
}
}

Answer 2

Try this:
struct NamesView_Previews: PreviewProvider {
static var previews: some View {
NamesView(match:.constant(Match()))
}
}

Answer 3

I wrote about this in depth here, but the short version is simply to add the following extension:
extension Binding {
public static func variable(_ value: Value) -> Binding<Value> {
var state = value
return Binding<Value> {
state
} set: {
state = $0
}
}
}
And then do...
struct NamesView_Previews : PreviewProvider {
static var previews: some View {
NamesView(match: .variable(Match()))
}
}
This lets you actually mutate the value, useful when doing live previews in Xcode 14.