@ObservedObject is a get-only property

[kuglee]

Describe the bug

   ERROR   cannot assign to property: 'testObservable' is a get-only property
  19 |      self.testObservable = TestObservable()
     |           ^

To Reproduce

import TokamakShim

struct TokamakApp: App {
    var body: some Scene {
        WindowGroup("Tokamak App") {
            ContentView()
        }
    }
}

public class TestObservable: ObservableObject {
  @Published var test = 0
}

public struct ContentView: View {
  @ObservedObject var testObservable: TestObservable
  
  public init() {
    self.testObservable = TestObservable()
  }

  public var body: some View {
    EmptyView()
  }
}

// @main attribute is not supported in SwiftPM apps.
// See https://bugs.swift.org/browse/SR-12683 for more details.
TokamakApp.main()

Expected behavior
The code compiles successfully.

Desktop (please complete the following information):

• OS: macOS
• Browser: Safari
• Version of the browser: 14.0.3 (16610.4.3.1.4)
• Version of Tokamak: 0.6.1

[foscomputerservices]

Did you try self._testObservable = TestObservable()? It is my understanding that this is how Swift actually stores property wrappers (reference).

[kuglee]

Then I get a different error:

   ERROR   cannot assign value of type 'TestObservable' to type 'ObservedObject<TestObservable>'
  20 |      self._testObservable = TestObservable()
     |

[foscomputerservices]

I apologize, I should not have replied from memory. I too have encountered this issue as a difference between the way that iOS works. The following workaround will work:

self._testObservable = ObservedObject(wrappedValue: TestObservable())

[kuglee]

Awesome. Thanks!