如何将Firebase下载文件与进度视图相关联？-HowtolinkFirebasedownloadfilewithaprogressview?

Below is the code I am using to download PDF files from Firebase storage.

以下是我用于从Firebase存储下载PDF文件的代码。

What I want to do is to link it with a download progress view with percentage instead of activity indicator.

我想要做的是将其与包含百分比而非活动指示符的下载进度视图链接。

import Foundation
import UIKit
import Firebase
import SwiftLoader


class showPdfVC: UIViewController , UIWebViewDelegate,ReaderViewControllerDelegate{


var pdfbooks = UIWebView()

var nIndex:NSInteger!
var post: Post!
var db : DBHelper = DBHelper()
var book : BookModel?


@IBAction func backbtn(_ sender: Any) {

    if let navCOntroller= self.navigationController {
        navController.popViewController(animated: true)
    }
}


override func viewDidLoad() {
    super.viewDidLoad()

    var config : SwiftLoader.COnfig= SwiftLoader.Config()
    config.size = 150
    config.spinnerColor = .brown
    config.foregroundColor = .black
    config.foregroundAlpha = 0.5
    config.titleTextColor = .brown


    SwiftLoader.setConfig(config)


    if "" !=  book?.bookPath {
     //   self.activityIND.isHidden = true
      //  self.activityIND.stopAnimating()
        UIApplication.shared.isNetworkActivityIndicatorVisible = false

        SwiftLoader.hide()

        loadReader(filePaht: (book?.bookPath)!)
    } else {

        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        let strName = book?.id
        let filePath = "\(documentsPath)/"+strName!+".pdf"
        let fileManager = FileManager.default
      //  self.activityIND.startAnimating()
         SwiftLoader.show(title: "Loading...", animated: true)
        UIApplication.shared.isNetworkActivityIndicatorVisible = true

        if fileManager.fileExists(atPath: filePath) {
        //    self.loadFromUrl(path: filePath)
            loadReader(filePaht: (book?.bookPath)!)
            return;
        }


        let reference = FIRStorage.storage().reference(forURL: (self.book?.bookURL)!)
        reference.data(withMaxSize: 50 * 1024 * 1024) { (data, error) -> Void in
            if (error != nil) {

                print ("unable to download pdf file from Firebase Storage")

            //    self.activityIND.isHidden = false
           //     self.activityIND.startAnimating()
                 SwiftLoader.show(title: "Loading...", animated: true)
                UIApplication.shared.isNetworkActivityIndicatorVisible = true

            } else {

                if ((try! data?.write(to: URL.init(fileURLWithPath: filePath, isDirectory: false))) != nil) {
             //       self.loadFromUrl(path: filePath)
                    print ("pdf file is downloaded from Firebase Storage")
                    self.db.upDate(id: (self.book?.id)!, bookPath: filePath)
                 //   self.activityIND.isHidden = true

                    SwiftLoader.hide()
                    self.loadReader(filePaht: filePath)

                    UIApplication.shared.isNetworkActivityIndicatorVisible = false



              }
            }
        }

    }
}


func loadReader(filePaht : String)  {

    let document = ReaderDocument(filePath: filePaht, password: nil)
    if document != nil {
        let readerVC = ReaderViewController(readerDocument: document)
        readerVC?.delegate = self
        readerVC?.modalTransitiOnStyle= UIModalTransitionStyle.crossDissolve
        readerVC?.modalPresentatiOnStyle= UIModalPresentationStyle.fullScreen
        self.navigationController?.pushViewController(readerVC!, animated: true)
    }

}

func dismiss(_ viewController: ReaderViewController!) {

   _ = self.navigationController?.popToRootViewController(animated: true)
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}
}

1 个解决方案

// Create a reference to the file we want to download
let starsRef = storageRef.child("images/stars.jpg")

// Start the download (in this case writing to a file)
let downloadTask = storageRef.write(toFile: localURL)

// Start progress indicator

// Observe changes in status
downloadTask.observe(.progress) { snapshot in
  // Download reported progress
  let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
    / Double(snapshot.progress!.totalUnitCount)
  // Update the progress indicator
}

downloadTask.observe(.success) { snapshot in
  // Download completed successfully
  // Stop progress indicator
}

// Errors only occur in the "Failure" case
downloadTask.observe(.failure) { snapshot in
  // An error occurred!
  // Stop progress indicator
}