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@IBACtion func btnStream(sender: UIButton) { // First you need to create your audio url if let audioUrl = NSURL(String: "http://website.com/file.mp3") { // then lets create your document folder url let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask).first as! NSURL // lets create your desTination file url let desTinationUrl = documentsUrl.URLByAppendingPathComponent(audioUrl.lastPathComponent!) println(desTinationUrl) // to check if it exists before downloading it if NSFileManager().fileExistsAtPath(desTinationUrl.path!) { println("The file already exists at path") // if the file doesn't exist } else { // just download the data from your url if let myAudioDataFromUrl = NSData(contentsOfURL: audioUrl){ // after downloading your data you need to save it to your desTination url if myAudioDataFromUrl.writeToURL(desTinationUrl,atomically: truE) { println("file saved") } else { println("error saving file") } } } } }
如何将我的下载进度与Swift中的Progress View链接？
import UIKit class ViewController: UIViewController,NSURLSessionDownloadDelegate { @IBOutlet weak var progressBar: UIProgressview! @IBOutlet weak var progressCount: UILabel! var task : NSURLSessionTask! var percentageWritten:Float = 0.0 var task@R_856_10586@lBytesWritten = 0 var task@R_856_10586@lBytesExpectedToWrite = 0 lazy var session : NSURLSession = { let config = NSURLSessionConfiguration.ephemeralSessionConfiguration() config.allowsCellularAccess = false let session = NSURLSession(configuration: config,delegate: self,delegateQueue: NSOperationQueue.mainQueue()) return session }() override func viewDidLoad() { progressBar.setProgress(0.0,animated: truE) //set progressBar to 0 at start } @IBACtion func doElaboratehttp (sender:AnyObject!) { progressCount.text = "0%" if self.task != nil { return } let s = "http://www.qdtricks.com/wp-content/uploads/2015/02/hd-wallpapers-1080p-for-mobile.png" let url = NSURL(String:s)! let req = NSMutableURLrequest(URL:url) let task = self.session.downloadTaskWithrequest(req) self.task = task task.resume() } func URLSession(session: NSURLSession,downloadTask: NSURLSessionDownloadTask,didWriteData bytesWritten: Int64,@R_856_10586@lBytesWritten writ: Int64,@R_856_10586@lBytesExpectedToWrite exp: Int64) { println("downloaded \(100*writ/exp)") task@R_856_10586@lBytesWritten = Int(writ) task@R_856_10586@lBytesExpectedToWrite = Int(exp) percentageWritten = Float(task@R_856_10586@lBytesWritten) / Float(task@R_856_10586@lBytesExpectedToWritE) progressBar.progress = percentageWritten progressCount.text = String(format: "%.01f",percentageWritten*100) + "%" } func URLSession(session: NSURLSession,didResumeAtOffset fiLeoffset: Int64,expected@R_856_10586@lBytes: Int64) { // unused in this example } func URLSession(session: NSURLSession,task: NSURLSessionTask,didCompleteWithError error: NSError?) { println("completed: error: \(error)") } // this is the only required NSURLSessionDownloadDelegate method func URLSession(session: NSURLSession,didFinishDownloadingToURL LOCATIOn: NSURL) { let documentsDirectoryURL = NSFileManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask).first as! NSURL println("Finished downloading!") println(documentsDirectoryURL) var err:NSError? // Here you can move your downloaded file if NSFileManager().moveItemAtURL(LOCATIOn,toURL: documentsDirectoryURl.URLByAppendingPathComponent(downloadTask.response!.suggestedFilename!),error: &err) { println("File saved") } else { if let err = err { println("File not saved.\n\(err.description)") } } } }
您可以使用NSURLSessionDownloadDelegate来实现此方法,在用户下载数据时将调用其方法.
这将显示进入progressCount标签的进程,progressBar将显示进程,因为count将递增.你可以根据需要修改它.
您可以从HERE下载此示例.
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