How to define a protocol to include a property with @Published property wrapper

Question

When using @Published property wrapper following current SwiftUI syntax, it seems very hard to define a protocol that includes a property with @Published, or I definitely ne

Answer 1

We've encountered this as well. As of Catalina beta7, there doesn't seem to be any workaround, so our solution is to add in a conformance via an extension like so:

struct IntView : View {
    @Binding var intValue: Int

    var body: some View {
        Stepper("My Int!", value: $intValue)
    }
}

protocol IntBindingContainer {
    var intValue$: Binding { get }
}

extension IntView : IntBindingContainer {
    var intValue$: Binding { $intValue }
}

While this is a bit of extra ceremony, we can then add in functionality to all the IntBindingContainer implementations like so:

extension IntBindingContainer {
    /// Reset the contained integer to zero
    func resetToZero() {
        intValue$.wrappedValue = 0
    }
}