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[
    "Africa/Abidjan",
    "Africa/Accra",
    "Africa/Addis_Ababa",
    "Africa/Algiers",
    "Africa/Asmara",
    "Africa/Bamako",
    "Africa/Bangui",
    "Africa/Banjul",
    "Africa/Bissau",

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[
  "WAT": "Africa/Lagos",
  "EAT": "Africa/Addis_Ababa",
  "MDT": "America/Denver",
  "ICT": "Asia/Bangkok",
  "TRT": "Europe/Istanbul",
  "PHT": "Asia/Manila",
  "CAT": "Africa/Harare",
  "EET": "Europe/Athens",
  "SGT": "Asia/Singapore",

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periodicTimeObserver = player.addPeriodicTimeObserver(forInterval: CMTime(value: CMTimeValue(1), timescale: 2), queue: DispatchQueue.main) {[weak self] (progressTime) in
    print("periodic time: \(CMTimeGetSeconds(progressTime))")
    self?.updatePlaybackProgress(progressTime: progressTime)
}

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let seekTime = PlayerPlaybackTimeFormatter.getConvertedCMTimeByProgress(player: player, progress: progressWhenSliderIsReleased)
player.seek(to: seekTime, toleranceBefore: .zero, toleranceAfter: .zero) { [weak self] _ in
    guard let `self` = self else { return }
    print("Player time after seeking: \(CMTimeGetSeconds(self.player.currentTime()))")
}

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/// Used to prevent progress bar updating while manually changing progress
public private(set) var isScrubbingInProgress: Bool = false 

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if !self.playbackManager.isScrubbingInProgress {
    /// Do not let scrubbing interfere with periodic observer
    self.controlsView.setProgress(progress: Float(self.playbackManager.currentPlaybackProgress))
    self.controlsView.updateCurrentTime(label: PlayerPlaybackTimeFormatter.getCurrentTimeFormatted(player: self.playbackManager.player)) /// update current time with playback current time
}

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private var progressBarHighlightedObserver: NSKeyValueObservation?
    
private lazy var progressBar: UISlider = {
    let bar = UISlider()
    bar.minimumTrackTintColor = .red
    bar.maximumTrackTintColor = .white
    bar.value = 0.0
    bar.isContinuous = false
    bar.addTarget(self, action: #selector(handleSliderChange), for: .valueChanged)
    self.progressBarHighlightedObserver = bar.observe(\UISlider.isTracking, options: [.old, .new]) { (_, change) in

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public private(set) var isSeekInProgress = false /// Used to notify whether to update playback progress bar


func manualSeekToProgress(progress: Float) {
    self.isSeekInProgress = true /// Mark
    let seekTime = PlayerPlaybackTimeFormatter.getConvertedCMTimeByProgress(player: player, progress: progress)
    player.seek(to: seekTime, toleranceBefore: .zero, toleranceAfter: .zero) { [weak self] _ in
        guard let `self` = self else { return }
        print("Player time after seeking: \(CMTimeGetSeconds(self.player.currentTime()))")
        self.isSeekInProgress = false /// Unmark

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private var button: UIButton = UIButton()

button.setTitle(NSLocalizedString("other-view-controller-button", value: "Button", comment: "Action button title in Other page"), for: .normal)

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class ResponderViewController: UIViewController {
    
    private var redView = UIView()
    private var greenView = UIView()
    private var blueView = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.subviews(redView.subviews(greenView).subviews(blueView))