1 func sessionLoadData(){
 2     //创建NSURL对象
 3     let urlString:String="http://hangge.com"
 4     var url:NSURL! = NSURL(string:urlString)
 5     //创建请求对象
 6     var request:NSURLRequest = NSURLRequest(URL: url)
 7      
 8     let session = NSURLSession.sharedSession()
 9    
10     var dataTask = session.dataTaskWithRequest(request,
11         completionHandler: {(data:NSData!, response:NSURLResponse!, error:NSError!) -> Void in
12             if error != nil{
13                 println(error?.code)
14                 println(error?.description)
15             }else{
16                 var str = NSString(data: data!, encoding: NSUTF8StringEncoding)
17                 println(str)
18             }
19     }) as NSURLSessionTask
20      
21     //使用resume方法启动任务
22     dataTask.resume()   
23 }

 1 import UIKit
 2  
 3 class ViewController: UIViewController ,NSURLSessionDownloadDelegate {
 4  
 5     override func viewDidLoad() {
 6         super.viewDidLoad()
 7          
 8         sessionSeniorDownload()
 9     }
10      
11     //下载文件
12     func sessionSeniorDownload(){
13         //下载地址
14         var url = NSURL(string: "http://hangge.com/blog/images/logo.png")
15         //请求
16         var request:NSURLRequest = NSURLRequest(URL: url!)
17          
18         let session = currentSession() as NSURLSession
19          
20         //下载任务
21         var downloadTask = session.downloadTaskWithRequest(request)
22          
23         //使用resume方法启动任务
24         downloadTask.resume()
25     }
26      
27     //创建一个下载模式
28     func currentSession() -> NSURLSession{
29         var predicate:dispatch_once_t = 0
30         var currentSession:NSURLSession? = nil
31         
32         dispatch_once(&predicate, {
33             var config = NSURLSessionConfiguration.defaultSessionConfiguration()
34             currentSession = NSURLSession(configuration: config, delegate: self, delegateQueue: nil)
35         })
36         return currentSession!
37     }
38      
39     //下载代理方法，下载结束
40     func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask,
41         didFinishDownloadingToURL location: NSURL) {
42         //下载结束
43         println("下载结束")
44          
45         //输出下载文件原来的存放目录
46         println("location:\(location)")
47         //location位置转换
48         var locationPath = location.path
49         //拷贝到用户目录
50         let documnets:String = NSHomeDirectory() + "/Documents/1.png"
51         //创建文件管理器
52         var fileManager:NSFileManager = NSFileManager.defaultManager()
53         fileManager.moveItemAtPath(locationPath!, toPath: documnets, error: nil)
54         println("new location:\(documnets)")
55     }
56      
57     //下载代理方法，监听下载进度
58     func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask,
59         didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
60         //获取进度
61         var written:CGFloat = (CGFloat)(totalBytesWritten)
62         var total:CGFloat = (CGFloat)(totalBytesExpectedToWrite)
63         var pro:CGFloat = written/total
64         println("下载进度：\(pro)")
65     }
66      
67     //下载代理方法，下载偏移
68     func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask,
69         didResumeAtOffset fileOffset: Int64, expectedTotalBytes: Int64) {
70         //下载偏移，主要用于暂停续传
71     }
72  
73     override func didReceiveMemoryWarning() {
74         super.didReceiveMemoryWarning()
75     }
76 }

 1 func sessionUpload(){
 2     //上传地址
 3     var url = NSURL(string: "http://hangge.com/")
 4     //请求
 5     var request:NSURLRequest = NSURLRequest(URL: url!)
 6      
 7     let session = NSURLSession.sharedSession()
 8      
 9     //上传数据流
10     let documents =  NSHomeDirectory() + "/Documents/1.png"
11     var imgData = NSData(contentsOfFile: documents)
12      
13     var uploadTask = session.uploadTaskWithRequest(request, fromData: imgData) {
14         (data:NSData!, response:NSURLResponse!, error:NSError!) -> Void in
15         //上传完毕后
16         println("上传完毕")
17     }
18      
19     //使用resume方法启动任务
20     uploadTask.resume()
21 }