以下是我用于从Firebase存储下载PDF文件的代码。
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相关联。
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()
}
}
答案 0 :(得分:2)
几点想法:
isNetworkActivityIndicatorVisible
,因为我们会为您做到这一点将它们放在一起,你会得到类似的东西:
// 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
}