Using the SwiftUI PreviewProvider to Display an Array

Question

Thanks to some help here I got this mostly working, but I'm not sure what the correct syntax is for how I can get SwiftUI's PreviewProvider to display the contents of my array "myDataModels".

Here is what I have:

import SwiftUI

struct Overview: View {
    var myDataModels: [MyDataModel]

    var body: some View {
        List {
            ForEach(myDataModels) { model in
                Section(header: Text("\(model.firstName) \(model.lastName)")) {

                    ForEach(model.cities, id: \.name) { (city: City) in

                        Section(header: Text(city.name).fontWeight(.bold)) {

                            ForEach(city.towns, id: \.name) { town in
                                Text(town.name)
                            }
                        }
                    }
                }
            }
        }
    }
}

Which compiles fine, but I'm not sure what the correct means of referencing myDataModels is for the PreviewProvider call just below the above block. Here is what I have there currently.

struct Overview_Previews: PreviewProvider {
    static var previews: some View {
        Overview(myDataModels: userData[0])
    }
}

userData is a reference to the JSON file. But I get the error:

Cannot convert value of type 'MyDataModel' to expected argument type '[MyDataModel]'

Any help us most appreciated.

What happens if you pass userData instead of userData[0] in your preview provider? — Andrew
– Andrew, Commented Oct 28, 2019 at 19:55
The error message was telling you what was wrong, you were passing a single object while your component was expecting an array. — Andrew
– Andrew, Commented Oct 28, 2019 at 20:05

drewster · Accepted Answer · 2019-11-04 21:59:48Z

0

Assuming you've defined userData somewhere, you can just do

Overview(myDataModels: userData)

Or if you want to just send the one specific item:

Overview(myDataModels: [userData[0]])

If this doesn't work, please post your definition of userData.

answered Nov 4, 2019 at 21:59

drewster

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