1. SwiftUI in UIView Here is my MessagesViewController: import UIKit import Messages class MessagesViewController: MSMessagesAppViewController {     let swiftUIView = MainView()     override func viewDidLoad() {         super.viewDidLoad()         addSubSwiftUIView(swiftUIView, to: view)     } } The code is simple because the magic is being done by the boilerplate in the UIViewController extension bellow. Got the the idea and code from the article 'Getting started with UIKit in SwiftUI and vice versa' by Antoine van der Lee. It works pretty well, no complains here. import UIKit import SwiftUI extension UIViewController {     func addSubSwiftUIView<Content>(_ swiftUIView: Content, to view: UIView) where Content : View {       let hostingController = UIHostingController(rootView: swiftUIView)         addChild(hostingController)         view.addSubview(hostingController.view)         hostingController.view.translatesAutoresizingMaskIntoConstraints = false         let constraints = [             hostingController.view.topAnchor.constraint(equalTo: view.topAnchor),             hostingController.view.leftAnchor.constraint(equalTo: view.leftAnchor),             view.bottomAnchor.constraint(equalTo: hostingController.view.bottomAnchor),             view.rightAnchor.constraint(equalTo: hostingController.view.rightAnchor)         ]         NSLayoutConstraint.activate(constraints)         hostingController.didMove(toParent: self)     } } 2. MSStickerView won’t auto-size To create an MSStickerView inside SwiftUI I'm using the following code. The frame: passed to the StickerView is not applied though. Without .frame(minWidth: size, minHeight: size), nothing is shown because the size becomes virtually zero. import Messages import SwiftUI import UIKit struct StickerView: UIViewRepresentable {     var frame: CGRect     var sticker: MSSticker?     func makeUIView(context: Context) -> MSStickerView {         MSStickerView(frame: frame, sticker: sticker)     }         func updateUIView(_ uiView: MSStickerView, context: Context) {             } } @ViewBuilder func makeStickerView(fromStickerData stickerData: StickerDataEntry, size: CGFloat = CGFloat(64)) -> some View {          if let sticker = try? MSSticker(contentsOfFileURL: stickerData.url!, localizedDescription: stickerData.description) {         StickerView(frame: CGRect(x: 0, y: 0, width: 408, height: 408), sticker: sticker)             .frame(minWidth: size, maxWidth: size, minHeight: size, maxHeight: size)           } } 4. Delete Main.Storyboard I’ve tried following similar instructions before and again just now, but to no avail. The result is a bank screen on the iPhone and the app icon in the middle of a blank screen on the simulator (running on a Mac mini M1). The relevant section of my Info.plist looks like this: <key>NSExtension</key> <dict> <key>NSExtensionPrincipalClass</key> <string>MessagesViewController</string> <key>NSExtensionPointIdentifier</key> <string>com.apple.message-payload-provider</string> </dict>

When I tried, registration was already closed. It's really frustrating, because it was open when I first tried and it was the one lab I really wanted to get an appointment for. Maybe someone here can help me? Here is the comment I wrote to request the lab. I am developing a Stickers Message app extension and want to use SwiftUI to build the the interface. I have a working version which uses a UIHostingController to load the main SwiftUI view and a UIViewRepresentable to load a MSStickerView inside SwiftUI. What I want to discuss is: Is there better strategy than the one above? Is there a way for MSStickerView do not auto-size correctly inside SwiftUI? It doesn’t currently.  Is there a way to eliminate the MessagesViewController and have an App.swift loading a ContentView instead? Is there a way to delete Main.Storyboard? I’m not using Storyboards, but didn’t find a way to update Info.plist in order to delete it.