Ios 如何在downloadTaskWithURL完成之前获得NSURL响应?
这是我的下载代码:Ios 如何在downloadTaskWithURL完成之前获得NSURL响应?,ios,swift,nsurl,nsurlsession,Ios,Swift,Nsurl,Nsurlsession,这是我的下载代码: let url = NSURL(string:"http://www.zastavki.com/pictures/originals/2013/Photoshop_Image_of_the_horse_053857_.jpg")! let documentsDirectoryURL = NSFileManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSU
let url = NSURL(string:"http://www.zastavki.com/pictures/originals/2013/Photoshop_Image_of_the_horse_053857_.jpg")!
let documentsDirectoryURL = NSFileManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL
NSURLSession.sharedSession().downloadTaskWithURL(url, completionHandler: {
(location, response, error) -> Void in
if let error = error {
println(error.description)
}
else {
println("Finished downloading \"\(response.suggestedFilename)\".")
println(location.path!)
println("Started saving \"\(response.suggestedFilename)\".")
if NSFileManager().moveItemAtURL(location, toURL: documentsDirectoryURL.URLByAppendingPathComponent(response.suggestedFilename!), error: nil) {
println("File saved")
} else {
println("The File \(response.suggestedFilename!) was not saved.")
}
}
}).resume()
正如现在一样,只有在完成处理程序中才能访问它
我的问题是如何在下载完成之前访问响应
我需要回复才能知道:
- 预期内容长度
- 建议的文件名
- 模版
init(configuration configuration: NSURLSessionConfiguration?,
delegate delegate: NSURLSessionDelegate?,
delegateQueue queue: NSOperationQueue?) -> NSURLSession
然后使用数据任务下载图像
在此委托方法中,您可以获得响应
然后将dataTask更改为downlaodTask
optional func URLSession(_ session: NSURLSession,
dataTask dataTask: NSURLSessionDataTask,
didReceiveResponse response: NSURLResponse,
completionHandler completionHandler: (NSURLSessionResponseDisposition) -> Void)
示例代码:
import UIKit
class ViewController: UIViewController,NSURLSessionDelegate,NSURLSessionDataDelegate,NSURLSessionDownloadDelegate{
var session:NSURLSession?
var dataTask:NSURLSessionDataTask?
let url = NSURL(string:"http://www.zastavki.com/pictures/originals/2013/Photoshop_Image_of_the_horse_053857_.jpg")!
var infoDic = NSMutableDictionary()
override func viewDidLoad() {
super.viewDidLoad()
let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
let manqueue = NSOperationQueue.mainQueue()
session = NSURLSession(configuration: configuration, delegate:self, delegateQueue: manqueue)
dataTask = session?.dataTaskWithRequest(NSURLRequest(URL: url))
dataTask?.resume()
// Do any additional setup after loading the view, typically from a nib.
}
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {
NSLog("%@",response.description)
completionHandler(NSURLSessionResponseDisposition.BecomeDownload)
}
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didBecomeDownloadTask downloadTask: NSURLSessionDownloadTask) {
downloadTask.resume()
}
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) {
NSLog("%@",location);
//Get response
NSLog("%@", downloadTask.response!.description)
}
}
所有文档都记录在这里:感谢您的回答,但我不想使用缓冲区,我想将其保存到tmp文件,缓冲区使用内存,我想将其保存到磁盘,就像我在代码中所示的那样,
DownloadTaskwithurl
是我的问题。我更新代码,通过这种方式,您不再需要缓冲区,您可以使用dataTask获得响应,然后将数据任务转换为DownloadTask。因此,这被保存到文件中。您可以在didfishdownloadingtourl
中以与代码相同的方式获取该文件。tmp文件位于位置
,您可以将其移动到其他路径。检查更新代码,我测试它,它工作正常。您可以从downloadingtask.response获得响应,忘记我之前说过的话