我试图使用urlSession
从远程网址下载文件。但是当下载完成时,出现一个名为CFNetworkDownload_gn6wzc.tmp
的意外文件,然后我无法使用uidocumentinteractioncontroller.
打开该文件。该文件是什么?如何解决这个问题。感谢回复。
这是消息
Your location is file:///Users/pisal/Library/Developer/CoreSimulator/Devices/26089E37-D4EA-49E5-8D45-BB7D9C52087D/data/Containers/Data/Application/767E966E-5954-41BA-B003-90E2D27C5558/Library/Caches/com.apple.nsurlsessiond/Downloads/com.SamboVisal.downloadTask/CFNetworkDownload_gn6wzc.tmp
以下是我的示例代码:我通过此方法发送链接
@IBAction func startDownload(_ sender: Any) {
let url = URL(string: "http://www.tutorialspoint.com/swift/swift_tutorial.pdf")!
let task = DownloadManager.shared.activate().downloadTask(with: url)
task.resume()
}
然后完成下载:
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
debugPrint("Download finished: \(location)")
debugPrint("download task : \(downloadTask)")
ViewController().documentInteraction(location: location)
}
当我试图打开uidocumentinteractioncontroller
let documentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let destinationPath = documentDirectoryPath.appendingPathComponent("swift.pdf")
let destinationUrl = URL(fileURLWithPath: destinationPath)
do{
try FileManager.default.copyItem(at: locat, to: destinationUrl)
}
catch {
print("error copying file: \(error.localizedDescription)")
}
documentInteractionController.url = destinationUrl
if !documentInteractionController.presentOpenInMenu(from: openButton.bounds, in: view, animated: true) {
print("You don't have an app installed that can handle pdf files.")
}
答案 0 :(得分:0)
下载的数据存储在临时文件中。您需要在文件中写入该数据并使用它。在func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
方法中编写以下代码:
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
debugPrint("Download finished: \(location)")
do {
let downloadedData = try Data(contentsOf: location)
DispatchQueue.main.async(execute: {
print("transfer completion OK!")
let documentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first! as NSString
let destinationPath = documentDirectoryPath.appendingPathComponent("swift.pdf")
let pdfFileURL = URL(fileURLWithPath: destinationPath)
FileManager.default.createFile(atPath: pdfFileURL.path,
contents: downloadedData,
attributes: nil)
if FileManager.default.fileExists(atPath: pdfFileURL.path) {
print("pdfFileURL present!") // Confirm that the file is here!
}
})
} catch {
print(error.localizedDescription)
}
}
修改强>
从服务器下载任何文件时,您的应用会将所有数据保存在临时文件中。下载文件后,它会为您提供临时保存数据的URL。现在,由您决定如何以及在何处存储该数据。临时文件不存储在Document目录中。您需要使用正确的扩展名复制文件中的该文件的内容。替换代码中的给定方法。如果要读取该文件,请使用swift.pdf
而不是tmp。