Instance member cannot be used on type in SwiftUI Preview

user_437242 0
Viewed 9364

Following error in my preview:

struct DetailView: View {
    var header: DataProvider.DataHeader

    var body: some View {
        Text("...")
    }
}

struct DetailView_Previews: PreviewProvider {
    var a = DataProvider.DataHeader(title: "a", text: "b")

    static var previews: some View {
        DetailView(header: a)
    }
}

Error is:

Instance member 'a' cannot be used on type 'DetailView_Previews'

Why this is happening?

swiftui preview
2 Answers

It is due to static var preview,

so use either static as well

static var a = DataProvider.DataHeader(title: "a", text: "b")

or construct in place

DetailView(header: DataProvider.DataHeader(title: "a", text: "b"))
user_122990300

SwiftUI Preview -> You have to use static var here:

struct ErrorView_Previews: PreviewProvider {
    @State static var alert = false
    @State static var error = "Please fill all the contents properly"

    static var previews: some View {
        ErrorView(alert: $alert, error: $error)
    }
}
user_30713460
Related