KVO is not available in the suite UserDefaults

• HostApp Code

Code Block swift
import UIKit
final class ViewController: UIViewController {
   
  @IBOutlet private weak var messageLabel: UILabel!
   
  private let userDefaults = UserDefaults(suiteName: "app_group_id")
  private let key = "key"
  private var context = 0
   
  override func viewDidLoad() {
    super.viewDidLoad()
    self.userDefaults?.addObserver(self, forKeyPath: self.key, options: .new, context: &self.context)
  }
   
  override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    guard context == &self.context,
       let change = change, let message = change[.newKey] as? String else { return }
    self.messageLabel.text = message
  }
   
  deinit {
    self.userDefaults?.removeObserver(self, forKeyPath: self.key, context: &self.context)
  }
}

• AppExtension Code

Code Block swift
import ReplayKit
final class SampleHandler: RPBroadcastSampleHandler {
   
  private let userDefaults = UserDefaults(suiteName: "app_group_id")
  private let key = "key"
   
  override func broadcastStarted(withSetupInfo setupInfo: [String : NSObject]?) {
    self.userDefaults?.setValue("Broadcast Started😄", forKey: self.key)
  }
   
  override func broadcastFinished() {
    self.userDefaults?.setValue("Broadcast Finished😴", forKey: self.key)
  }
}