ProgressView UI가 표시되지 않지만 레이블이 있습니다. [빠른]

모든 tabBar 뷰 컨트롤러에서 progressView를 사용하여 사용자가 데이터가로드되는 양을 확인하면서 앱을 사용할 수 있도록하고 싶습니다.

내가 가진 문제는 progressView UI가 레이블 만 표시하지 않는다는 것입니다. 나는 모든 것을 올바르게 설정하고 그것이 0이 아닌지 확인한다고 생각합니다. 감사합니다.

TabBarViewController

import UIKit

let progressViewTag = 10000
let progressUpdateNotification = "progressUpdateNotification"
var progressLabel = UILabel()

class TabBarViewController: UITabBarController {
   
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let progressView = UIProgressView(progressViewStyle: .bar)
        progressView.tag = progressViewTag
        progressView.frame = CGRect(x: 0, y: 93, width: self.view.frame.width, height: 5)
        progressView.transform = progressView.transform.scaledBy(x: 1, y: 5)
        progressView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(progressView)
        
        progressLabel = UILabel(frame: CGRect(x: 0, y: 91, width: UIScreen.main.bounds.width, height: 8))
        progressLabel.translatesAutoresizingMaskIntoConstraints = true
        progressLabel.textAlignment = .center
        progressLabel.font = UIFont.boldSystemFont(ofSize: 8)
        progressLabel.textColor = UIColor.white
        self.view.addSubview(progressLabel)
        
        progressView.setProgress(0.0, animated: false)
        
        NotificationCenter.default.addObserver(self, selector: #selector(didReceiveNotification(notification:)), name: NSNotification.Name(rawValue: progressUpdateNotification), object: nil)
    }
    
    var progressView: UIProgressView? {
        return self.view.viewWithTag(progressViewTag) as? UIProgressView
    }
    
    @objc func didReceiveNotification(notification: NSNotification) {
        if let progress = notification.object as? ProgressNotification {
            if progress.current == progress.total {
                progressLabel.text = ""
                self.progressView?.setProgress(0.0, animated: false)
                
            } else {
                let perc = Float(progress.current) / Float(progress.total)
                progressLabel.text = "Scraping \(String(format: "%.0f", (perc * 100))) % ..."
                self.progressView?.setProgress(perc, animated: true)
            }
        }
    }
}

class ProgressNotification {
    var current: Int = 0
    var total:   Int = 0
}

알림이있는 서버 호출

func apiCall(sender: UIViewController, counter: Int, completion: (()-> Void)? = nil) {
var count = counter
let total = 5
let notification = ProgressNotification()

counting(completion: { result in
    count += 1
    notification.current = count
    notification.total = total
    DispatchQueue.main.async {
        NotificationCenter.default.post(name:Notification.Name(rawValue: progressUpdateNotification), object: notification)
        print("notificationCenter called.")
    }
    
    .
    .
    .
    }
}