SwiftUI Previews struct "Missing argument for parameter 'text' in call"

Asked Nov 06 '19 at 00:22

Active Nov 06 '19 at 00:47

Viewed 1,307 times

I have wrapped a custom UIView inside a SwiftUI View and the Preview struct is giving me problems:

struct ContentView: UIViewRepresentable {
    @Binding var text: String
    ....
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some UIViewRepresentable {
        ContentView() // This is the offending line. It wants to change it to:
                      // ContentView(text: <#Binding<String>#>)
    }
}

What can I do to get this to work right? Why is it asking for a text argument?

Thanks!

edited Nov 06 '19 at 00:47

asked Nov 06 '19 at 00:22

Lester

2

did you added variables to your view? – NicolasElPapu Nov 06 '19 at 00:35
The compiler is easily confused and will start generating errors and suggested fixed that are not correct. When this happens to me, I start disabling chunks of code to isolate the actual problem. It is usually a missing comma, variable name or bracket in some other location. – Gene Z. Ragan Nov 06 '19 at 00:39
Yes, @NicolasElPapu. I did add variables. :) – Lester Nov 06 '19 at 00:40
@Lester can you try passing your variable/s as arguments to the ContentView() initializer? – NicolasElPapu Nov 06 '19 at 00:45
I am not familiar with that concept. I could declare them in an initializer, but I have never seen them passed through it. I am a bit embarassed. – Lester Nov 06 '19 at 00:49
Try: ContentView(text: "hello") – NicolasElPapu Nov 06 '19 at 00:53
Actually it says: Cannot convert value of type 'String' to expected argument type 'Binding' – Lester Nov 06 '19 at 00:55
That fixed it. I needed to use a @State variable. Thank you. – Lester Nov 06 '19 at 01:47

SwiftUI Previews struct "Missing argument for parameter 'text' in call"

0 Answers0