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func sessionLoadData(){ //创建NSURL对象 let url:NSURL! = NSURL(string:urlString) //创建请求对象 let request:NSURLRequest = NSURLRequest(URL: url) let session = NSURLSession.sharedSession() let dataTask = session.dataTaskWithRequest(request, completionHandler: {(data:NSData!, response:NSURLResponse!, error:NSError!) -> Void in if error != nil{ print(error?.code) print(error?.description) }else{ let str = NSString(data: data!, encoding: NSUTF8StringEncoding) print(str) } }) as NSURLSessionTask //使用resume方法启动任务 dataTask.resume() } |
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func sessionSimpleDownload(){ //下载地址 //请求 var request:NSURLRequest = NSURLRequest(URL: url!) let session = NSURLSession.sharedSession() //下载任务 var downloadTask = session.downloadTaskWithRequest(request, completionHandler: { (location:NSURL!, response:NSURLResponse!, error:NSError!) -> Void in //输出下载文件原来的存放目录 println("location:\(location)") //location位置转换 var locationPath = location.path //拷贝到用户目录 let documnets:String = NSHomeDirectory() + "/Documents/1.png" //创建文件管理器 var fileManager:NSFileManager = NSFileManager.defaultManager() fileManager.moveItemAtPath(locationPath!, toPath: documnets, error: nil) println("new location:\(documnets)") }) //使用resume方法启动任务 downloadTask.resume()} |
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import UIKitclass ViewController: UIViewController ,NSURLSessionDownloadDelegate { override func viewDidLoad() { super.viewDidLoad() sessionSeniorDownload() } //下载文件 func sessionSeniorDownload(){ //下载地址 //请求 var request:NSURLRequest = NSURLRequest(URL: url!) let session = currentSession() as NSURLSession //下载任务 var downloadTask = session.downloadTaskWithRequest(request) //使用resume方法启动任务 downloadTask.resume() } //创建一个下载模式 func currentSession() -> NSURLSession{ var predicate:dispatch_once_t = 0 var currentSession:NSURLSession? = nil dispatch_once(&predicate, { var config = NSURLSessionConfiguration.defaultSessionConfiguration() currentSession = NSURLSession(configuration: config, delegate: self, delegateQueue: nil) }) return currentSession! } //下载代理方法，下载结束 func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) { //下载结束 println("下载结束") //输出下载文件原来的存放目录 println("location:\(location)") //location位置转换 var locationPath = location.path //拷贝到用户目录 let documnets:String = NSHomeDirectory() + "/Documents/1.png" //创建文件管理器 var fileManager:NSFileManager = NSFileManager.defaultManager() fileManager.moveItemAtPath(locationPath!, toPath: documnets, error: nil) println("new location:\(documnets)") } //下载代理方法，监听下载进度 func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) { //获取进度 var written:CGFloat = (CGFloat)(totalBytesWritten) var total:CGFloat = (CGFloat)(totalBytesExpectedToWrite) var pro:CGFloat = written/total println("下载进度：\(pro)") } //下载代理方法，下载偏移 func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didResumeAtOffset fileOffset: Int64, expectedTotalBytes: Int64) { //下载偏移，主要用于暂停续传 } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() }} |
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func sessionUpload(){ //上传地址 //请求 var request:NSURLRequest = NSURLRequest(URL: url!) let session = NSURLSession.sharedSession() //上传数据流 let documents = NSHomeDirectory() + "/Documents/1.png" var imgData = NSData(contentsOfFile: documents) var uploadTask = session.uploadTaskWithRequest(request, fromData: imgData) { (data:NSData!, response:NSURLResponse!, error:NSError!) -> Void in //上传完毕后 println("上传完毕") } //使用resume方法启动任务 uploadTask.resume()} |
Swift - 使用NSURLSession加载数据、下载、上传文件
原文：http://www.cnblogs.com/Free-Thinker/p/4843546.html
