How to bind an array to a list using SwiftUI

Question

I'm trying to bind an array to a list in SwiftUI. I've been struggling to understand how to do this given that I'm quite new to SwiftUI et. al. Here's what I'm trying to:

struct ContentView: View {
    @Binding var text: String
    @Binding var results: [MKLocalSearchCompletion]

    var body: some View {
        VStack {
            MapView()
            MapSearchBar(text: $text, results: $results)
            List($results) { result in
                Text(result.title)
            }
        }
    }
}

Presently getting, Generic parameter 'SelectionValue' could not be inferred', which I understand-ish, but I can't seem to find my way...

I've not yet come across great doco on this, but I'm happy to be pointed at some.

sfung3 · Accepted Answer · 2020-03-24 00:18:44Z

3

results is a binding so you do not need a read-write binding in the list parameter. Also, to fix the generic parameter, add an id.

struct ContentView: View {
    @Binding var text: String
    @Binding var results: [MKLocalSearchCompletion]

    var body: some View {
        VStack {
            MapView()
            MapSearchBar(text: $text, results: $results)
            List(results, id: \.self) { result in
                Text(result.title)
            }
        }
    }
}

edited Mar 24, 2020 at 0:18

answered Mar 23, 2020 at 23:08

sfung3

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3 Comments

Christopher Hunt Over a year ago

Thank you so much. That did the trick. Using the $ for just for read-write now makes complete sense to me.

Christopher Hunt Over a year ago

I like the \.self also. I've not seen that before.

Swantewit Over a year ago

I have a similar problem, but I don't understand the solution since the program looks different than in my case. I have a sample array of 3 strings called repository names inside Data class. How can I bind it to a new created list, @sfung3?

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