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The above code (without NSObject) compiles and runs for me on Xode 11 GM and macos catalina beta 8.

On another forum, I saw a comment that someone addressed this by making the class that conforms to ObservableObject a subclass of NSObject. I tried this change and it fixed the issue. I did not see anything in the documentation or the release notes indicating the class has to be a subclass of NSObject, but at least this apparently is a viable work around for now.>>>>import SwiftUIpublic class TestClass: NSObject, ObservableObject { @Published public var str: String = "Goodbye"}struct ContentView: View { @ObservedObject public var testObject: TestClass var body: some View { Text(testObject.str) .frame(maxWidth: .infinity, maxHeight: .infinity) }}

I instantiate the object in the calling object (in this case AppDelegate.swift) and initialize it through the autogenerated init for ContentVIew. I did not include this code for brevity.import Cocoaimport SwiftUI@NSApplicationMainclass AppDelegate: NSObject, NSApplicationDelegate {.... func applicationDidFinishLaunching(_ aNotification: Notification) { ... window.contentView = NSHostingView(rootView: ContentView(testObject: TestClass())) ... }...}