Swift NSURLSession didFinishDownloadingURL 从临时文件移动

Question

我正在尝试使用 NSURL 库和下面的函数下载文件。它曾经将其存储在临时文件夹中，因此在文件被删除之前我无法访问这些文件。

我正在尝试将下载的文件重新定位到 Documents 目录，但是当我尝试将 NSData 打印为 NSString 时，它 returns 没有。我不明白下面的代码有什么问题。

func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) {

    //create a NSFileManager Instance
    let fileManager = NSFileManager.alloc()
    //Get documents directory URL
    let documentsUrl:NSArray = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
    let documentsDirectory:NSURL = documentsUrl.firstObject as NSURL

    //Get the file name and create a destination URL
    let sendingFileName = downloadTask.originalRequest.URL
    //convert sendingFileName into String
    let fileString = sendingFileName.absoluteString
    let destinationURL = documentsDirectory.URLByAppendingPathComponent(fileString!)

    //Hold this file as an NSData and write it to the new location
    let fileData = NSData(contentsOfURL: location)
    let fileDataString = NSString(data: fileData!, encoding: NSUTF8StringEncoding)
    println(fileDataString)
    fileData?.writeToURL(destinationURL, atomically: false)


}

Answer 1

您应该 NSFileManager.defaultManager() 代替。如果您打印出您的目的地 URL 它说了什么？

Answer 2

这也应该有效。

let fileManager = NSFileManager.defaultManager()

    //Get documents directory URL
    let documentsDirectory = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL

    // Check if file exist
    if (fileManager.fileExistsAtPath(documentsDirectory)){
        fileManager.removeItemAtURL(NSURL(documentsDirectory), error: nil)
    }

    // Copy File From Temp Folder To Documents Directory
    fileManager.copyItemAtURL(location, toURL: NSURL(fileURLWithPath: documentsDirectory), error: &error)

Swift NSURLSession didFinishDownloadingURL 从临时文件移动

Swift NSURLSession didFinishDownloadingURL moving from Temp file

ios

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nsurl

temporary