SwiftUI Game Center authentication doesn't prompt user to login - swift

Question

I have the below code to authenticate a local player in Game Center in my SwiftUI app. I want Game Center to prompt user to login if the player is not already login in but this doesn't happen.
class AppSettings: UINavigationController {
func authenticateUser() {
let localPlayer = GKLocalPlayer.local
localPlayer.authenticateHandler = { vc, error in
guard error == nil else {
print(error?.localizedDescription ?? "")
return
}
}
}
}
What could be the problem? I also read about using UIViewControllerRepresentable somewhere in my class to integrate UIKit's ViewController into SwiftUI but I don't understand how I can use it.
Can someone help me out?

Answer 1

I didn't get anyone to answer my question correctly and after days of digging I found a solution. So I had to use the UIKit implementation like below and create a wrapper around it using UIViewControllerRepresentable in the GameCenterManager Struct. After that all I had to do was call GameCenterManager() inside my SwiftUI view in a ZStack and the job is done!
import SwiftUI
import UIKit
import GameKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
authenticateUser()
}
let localPlayer = GKLocalPlayer.local
func authenticateUser() {
localPlayer.authenticateHandler = { vc, error in
guard error == nil else {
print(error?.localizedDescription ?? "")
return
}
if vc != nil {
self.present(vc!, animated: true, completion: nil)
}
if #available(iOS 14.0, *) {
GKAccessPoint.shared.location = .bottomLeading
GKAccessPoint.shared.showHighlights = true
GKAccessPoint.shared.isActive = self.localPlayer.isAuthenticated
// Fallback on earlier versions
}
}
}
}
struct GameCenterManager: UIViewControllerRepresentable {
func makeUIViewController(context: UIViewControllerRepresentableContext<GameCenterManager>) -> ViewController {
let viewController = ViewController()
return viewController
}
func updateUIViewController(_ uiViewController: ViewController, context: UIViewControllerRepresentableContext<GameCenterManager>) {
}
}

Answer 2

The authenticateHandler returns a UIViewController as well which you're not using:
#available(iOS 6.0, *)
open var authenticateHandler: ((UIViewController?, Error?) -> Void)?
You need to present it:
class AppSettings: UINavigationController {
func authenticateUser() {
let localPlayer = GKLocalPlayer.local
localPlayer.authenticateHandler = { vc, error in
guard error == nil else {
print(error?.localizedDescription ?? "")
return
}
if let vc = vc {
self.present(vc, animated: true, completion: nil)
}
}
}
}