ProgressView UI 未显示，但标签显示。 [Swift]

Question

我想在所有 tabBar 视图控制器中使用我的 progressView，以便用户可以在使用该应用程序的同时查看正在加载的数据量。

我遇到的问题是 progressView UI 不只显示标签。我想我正确设置了所有内容并检查它是否为零（它不是）。请帮忙谢谢

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
}

带通知的服务器调用

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.")
    }
    
    .
    .
    .
    }
}

Answer 1

    progressView.translatesAutoresizingMaskIntoConstraints = false

改为.

    progressView.translatesAutoresizingMaskIntoConstraints = true

同时更新 UIProgressView 的代码

var progressView: UIProgressView? {
    return self.view.viewWithTag(progressViewTag) as? UIProgressView
}

改为.

var progressView : UIProgressView?

class TabBarViewController: UITabBarController {
   
override func viewDidLoad() {
    super.viewDidLoad()
    
    self.progressView = UIProgressView(progressViewStyle: .bar)
}

ProgressView UI 未显示，但标签显示。 [Swift]

ProgressView UI not showing but the Label is. [Swift]

uitabbarcontroller

uiprogressview

swift