CODEWITHSUNDEEP
swiftuiswiftui-previews
Edward Brey
Edward Brey

Reputation: 41738

Preview SwiftUI private non-default @State

SwiftUI state properties should be declared as private. This is good for encapsulating their values from containing views, but prevents a preview from setting a non-default state using the default initializer. For example, this doesn't compile:

struct TemperatureView: View {
    @State private var isHot = false
    
    var body: some View {
        Text(isHot ? "Hot" : "Cold")
    }
}

struct TemperatureView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            TemperatureView(isHot: true)
            TemperatureView(isHot: false)
        }
    }
}

Replacing private with fileprivate results in the same error. How can I preview private view state?

Upvotes: 1

Views: 1199

Answers (1)

ChrisR
ChrisR

Reputation: 12165

as it is @State you might want to do:

init() {}

fileprivate init(isHot: Bool) {
    self._isHot = State(initialValue: isHot)
}

Upvotes: 5

Related Questions