An observer for AVPlayer's currentTime that publishes it with Combine

PlayerTimeObserver.swift

import Combine

class PlayerTimeObserver {
  let publisher = PassthroughSubject<TimeInterval, Never>()
  private var timeObservation: Any?
  
  init(player: AVPlayer) {
    // Periodically observe the player's current time, whilst playing
    timeObservation = player.addPeriodicTimeObserver(forInterval: CMTime(seconds: 0.5, preferredTimescale: 600), queue: nil) { [weak self] time in
      guard let self = self else { return }
      // Publish the new player time
      self.publisher.send(time.seconds)
    }
  }
}