swift：文件解压缩时显示UIActivityIndi​​catorView

我使用此代码下载我的文件并显示在我的标签中下载的进度。

我的代码：

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MasterViewCell let cellFilePath = "\(indexPath.section)\(indexPath.row).zip" let indexOfTask = allDownloadTasks.index { (task:URLSessionDownloadTask) -> Bool in return task.currentRequest?.url?.lastPathComponent == cellFilePath } if indexOfTask == nil { //cell.label?.isHidden = true } return cell } func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) let documentDirectoryPath:String = path[0] let fileManager = FileManager() let destinationURLForFile = URL(fileURLWithPath: documentDirectoryPath.appendingFormat("/file.png")) if fileManager.fileExists(atPath: destinationURLForFile.path){ animation() } else { let url = URL(string: "link")! let downloadTaskLocal = self.backgroundSession.downloadTask(with: url) self.allDownloadTasks.append(downloadTaskLocal) // Add a new task to the array downloadTaskLocal.resume() cell.label?.frame = CGRect(x: 70, y: 128, width: 82, height: 21) cell.label?.isHidden = false } } func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64){ DispatchQueue.main.async(execute: {() -> Void in if let visibleIndexPath = self.collectionView?.indexPathsForVisibleItems { for visibleIndexPath in visibleIndexPath { if (downloadTask.currentRequest?.url?.lastPathComponent == "\(visibleIndexPath.section)\(visibleIndexPath.row).zip") { var myCell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: visibleIndexPath) as! MasterViewCell myCell = self.collectionView?.cellForItem(at: visibleIndexPath) as! MasterViewCell myCell.label.text = "\(Int(CGFloat(totalBytesWritten) / CGFloat(totalBytesExpectedToWrite) * 100.0))%" if myCell.label?.text == "100%" { myCell.label?.isHidden = true myCell.activityIndicator?.isHidden = true myCell.activityIndicator?.startAnimating() } } } } }) } 

我有这个代码来解压缩我的文件：

 func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL){ let fileName = downloadTask.originalRequest?.url?.lastPathComponent let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) let documentDirectoryPath:String = path[0] let fileManager = FileManager() let destinationURLForFile = URL(fileURLWithPath: documentDirectoryPath.appendingFormat("/\(String(describing: fileName!))")) do { try fileManager.moveItem(at: location, to: destinationURLForFile) }catch{ print("error") } let indexOfComplatedTask = allDownloadTasks.index(of: downloadTask) if indexOfComplatedTask != nil { SSZipArchive.unzipFile(atPath: documentDirectoryPath.appendingFormat("/\(String(describing: fileName!))"), toDestination:documentDirectoryPath, delegate:self) do { try fileManager.removeItem(atPath: documentDirectoryPath.appendingFormat("/\(String(describing: fileName!))")) } catch let error as NSError { print("Ooops! Something went wrong: \(error)") } } } 

我希望在文件解压缩和停止动画时显示我的activityIndicator并启动动画，并在文件停止解压缩后将其删除。 我还在storyboard中创建了label和activityIndi​​cator。

怎么做？？？？？

Answer 1

检查以下代码。

 do { try fileManager.moveItem(at: location, to: destinationURLForFile) }catch{ print("error") } let indexOfComplatedTask = allDownloadTasks.index(of: downloadTask) if indexOfComplatedTask != nil { **// Start animating your activityIndicator here. // Use unzipFile API having completion block callback // In the completion callback stop your activityIndicator** SSZipArchive.unzipFile(atPath: documentDirectoryPath.appendingFormat("/\(String(describing: fileName!))"), toDestination:documentDirectoryPath, delegate:self) 

如果有任何疑问，请告诉我。

Answer 2

也许你可以切换到ZIP Foundation – 它还有一个简单的解压缩方法，它支持进度跟踪。 所以你甚至可以显示某种进度指示器。

解压缩代码与您在上面发布的代码类似：

 let fileManager = FileManager() let currentWorkingPath = fileManager.currentDirectoryPath var sourceURL = URL(fileURLWithPath: currentWorkingPath) sourceURL.appendPathComponent("archive.zip") var destinationURL = URL(fileURLWithPath: currentWorkingPath) destinationURL.appendPathComponent("directory") do { try fileManager.createDirectory(at: destinationURL, withIntermediateDirectories: true, attributes: nil) try fileManager.unzipItem(at: sourceURL, to: destinationURL) } catch { print("Extraction of ZIP archive failed with error:\(error)") } 

有关进度跟踪的一些详细信息，请访问： https ： //github.com/weichsel/ZIPFoundation#progress-tracking-and-cancellation