How to get notified in SwiftUI when UIKit UIViewController viewDidLoad finished - ios

Question

I have a UIViewController working fine in SwiftUI with the below code.
import Foundation
import SwiftUI
final class RTCVideoViewController: UIViewController {
var previewView: RTCEAGLVideoView!
var videoTrack: RTCVideoTrack!
override func viewDidLoad() {
previewView = RTCEAGLVideoView(frame: CGRect(x:0, y:0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
previewView.contentMode = UIView.ContentMode.scaleAspectFit
view.addSubview(previewView)
do {
videoTrack = try MediaCapturer.shared.createVideoTrack(videoView: previewView)
} catch {
print(error)
}
}
}
extension RTCVideoViewController : UIViewControllerRepresentable{
public typealias UIViewControllerType = RTCVideoViewController
public func makeUIViewController(context: UIViewControllerRepresentableContext<RTCVideoViewController>) -> RTCVideoViewController {
return RTCVideoViewController()
}
public func updateUIViewController(_ uiViewController: RTCVideoViewController, context: UIViewControllerRepresentableContext<RTCVideoViewController>) {
}
}
In SwiftUI view.
import Combine
import SwiftUI
struct LiveView: View {
#ObservedObject var viewModel: LiveViewModel
init(viewModel: LiveViewModel) {
self.viewModel = viewModel
}
var body: some View {
return ZStack {
RTCVideoViewController()
.edgesIgnoringSafeArea(.top)
}
}
}
So far everything works fine but I need the RTCVideoTrack when created to pass it to the LiveViewModel.
Any ideas what pattern I could implement to get notified when viewDidLoad finished or RTCVideoTrack passed to the LiveViewModel?

Answer 1

I changed a bit the code, it was close but simplified more.
import Foundation
import SwiftUI
struct RTCVideoViewController : UIViewControllerRepresentable {
var viewModel: LiveViewModel
func makeUIViewController(context: Context) -> UIViewController {
UIViewController()
}
func updateUIViewController(_ viewController: UIViewController, context: Context) {
print("HostBroadcastViewController:updateUIViewController")
let previewView = RTCEAGLVideoView(frame: CGRect(x:0, y:0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height))
previewView.contentMode = UIView.ContentMode.scaleAspectFit
viewController.view.addSubview(previewView)
do {
let videoTrack = try MediaCapturer.shared.createVideoTrack(videoView: previewView)
self.viewModel.videoTrack = videoTrack
}
catch {
print("ERROR getting RTCVideoTrack")
}
}
}
And in SwiftUI init the RTCVideoViewController with RTCVideoViewController(viewModel: self.viewModel) where ViewModel passed in view from parent.