xcode 下载pdf文件并保存在文档目录中
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/51374225/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Download pdf file and save in document directory
提问by Mario Burga
I have the following code that allows me to download a PDF file from a URL, it works correctly:
我有以下代码允许我从 URL 下载 PDF 文件，它可以正常工作：
class ViewController: UIViewController {
@IBOutlet weak var progressView: UIProgressView!
override func viewDidLoad() {
let _ = DownloadManager.shared.activate()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
DownloadManager.shared.onProgress = { (progress) in
OperationQueue.main.addOperation {
self.progressView.progress = progress
}
}
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
DownloadManager.shared.onProgress = nil
}
@IBAction func startDownload(_ sender: Any) {
let url = URL(string: "https://d0.awsstatic.com/whitepapers/KMS-Cryptographic-Details.pdf")!
let task = DownloadManager.shared.activate().downloadTask(with: url)
task.resume()
}
}
The file is going to: file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/8B5CBFC8-7058-48DB-A1C4-872302A80610/Library/Caches/com.apple.nsurlsessiond/Downloads/com.example.DownloadTaskExample/CFNetworkDownload_Q7OVlf.tmp
该文件将： file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/8B5CBFC8-7058-48DB-A1C4-872302A80610/Library/Caches/com.apple.nsurlsessiond/Downloads/com.example.DownloadTaskExample/CFNetworkDownload_Q7OVlf.tmp
How do I save it in /Documents/
我如何将它保存在 /Documents/
Something like this :file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/64370B29-2C01-470F-AE76-17EF1A7BC918/Documents/
像这样的事情：file:///Users/cybermac/Library/Developer/CoreSimulator/Devices/CAEC75D0-423A-4FB2-B0D6-9E7CADB190A1/data/Containers/Data/Application/64370B29-2C01-470F-AE76-17EF1A7BC918/Documents/
The idea is that the file saved in that directory can be used to read it offline (with PDFKit or webKit). It will only be deleted if the application is deleted.
这个想法是保存在该目录中的文件可用于离线读取（使用 PDFKit 或 webKit）。只有当应用程序被删除时，它才会被删除。
采纳答案by Sharad Chauhan
You need to move file to your custom location after the download. Implement URLSessionDownloadDelegateand you will receive location of your downloaded file.
下载后您需要将文件移动到您的自定义位置。实施URLSessionDownloadDelegate，您将收到下载文件的位置。
Delegate method :
委托方法：
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
Code to move file :
移动文件的代码：
do {
let documentsURL = try
FileManager.default.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: false)
let savedURL = documentsURL.appendingPathComponent("yourCustomName.pdf")
try FileManager.default.moveItem(at: location, to: savedURL)
} catch {
print ("file error: \(error)")
}
To know more refer this repo : https://github.com/skdevil/PrakrstaFileDownloader
要了解更多信息，请参阅此 repo：https: //github.com/skdevil/PrakrstaFileDownloader
