Swift - 使用NSURL进行数据的提交和获取（POST与GET）

使用Swift进行iOS开发时，不可避免的要进行远程的数据获取和提交。 其数据请求的方式既可能是POST也可能是GET。同不管是POST还是GET又可以分为同步请求和异步请求。 下面通过四个例子来进行演示。

1，使用POST方式提交数据（用户id和分数）

（1）同步请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

//保存分数 func saveScore(score:Int, userid:String) {     let urlString:String = "http://hangge.com/"     var url:NSURL!     url = NSURL(string:urlString)     var request = NSMutableURLRequest(URL:url)     var body = "score=\(score)&user=\(userid)"     //编码POST数据     var postData = body.dataUsingEncoding(NSUTF8StringEncoding)     //保用 POST 提交     request.HTTPMethod = "POST"     request.HTTPBody = postData           //响应对象     var response:NSURLResponse?     //错误对象     var error:NSError?           //发出请求     var received:NSData? = NSURLConnection.sendSynchronousRequest(request,         returningResponse: &response, error: &error)           if(error != nil){         println(error?.code)         println(error?.description)     }else{         var datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)         println(datastring)     } }

（2）异步请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

import UIKit   class ScoreController:NSObject, NSURLConnectionDataDelegate {     //保存分数     func saveScore(score:Int, userid:String)     {         let urlString:String = "http://hangge.com/savescore.php"         var url:NSURL!         url = NSURL(string:urlString)         var request = NSMutableURLRequest(URL:url)         var body = "score=\(score)&user=\(userid)"         //编码POST数据         var postData = body.dataUsingEncoding(NSASCIIStringEncoding)         //保用 POST 提交         request.HTTPMethod = "POST"         request.HTTPBody = postData         var conn:NSURLConnection!         conn = NSURLConnection(request: request,delegate: self)         conn.start()         println(conn)     }              func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!)     {         println("请求成功！");         println(response)     }           func connection(connection: NSURLConnection!, didReceiveData data: NSData!)     {         println("请求成功1！");         var datastring = NSString(data:data, encoding: NSUTF8StringEncoding)         println(datastring)     }           func connectionDidFinishLoading(connection: NSURLConnection!)     {         println("请求成功2！");     } }

2，使用GET方式获取数据（用户id对应的分数）

（1）同步请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

//获取分数 func getScore(user:String){           let urlString:String="http://hangge.com/getscore.php?user=\(user)"     var url:NSURL!     url = NSURL(string:urlString)     var request = NSMutableURLRequest(URL:url)     request.HTTPMethod = "GET"           //响应对象     var response:NSURLResponse?     //错误对象     var error:NSError?           //发出请求     var received:NSData? = NSURLConnection.sendSynchronousRequest(request,         returningResponse: &response, error: &error)           if(error != nil){         println(error?.code)         println(error?.description)     }else{         var datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)         println(datastring)     } }

（2）异步请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

import UIKit   class ScoreController:NSObject, NSURLConnectionDataDelegate {        //获取分数     func getScore(user:String)     {         let urlString:String="http://hangge.com/getscore.php?user=\(user)"         var url:NSURL!         url = NSURL(string:urlString)         var request = NSMutableURLRequest(URL:url)                   var body = "user=\(user)"         request.HTTPMethod = "GET"         var conn:NSURLConnection!         conn = NSURLConnection(request: request,delegate: self)         conn.start()         println(conn)     }           func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!)     {         println("请求成功！");         println(response)     }           func connection(connection: NSURLConnection!, didReceiveData data: NSData!)     {         println("请求成功1！");         var datastring = NSString(data:data, encoding: NSUTF8StringEncoding)         println(datastring)         //解析 JSON 数据         var json : AnyObject! = NSJSONSerialization.JSONObjectWithData(data,             options:NSJSONReadingOptions.AllowFragments,error:nil)                   var score = json.objectForKey("score") as Int         println(score)     }           func connectionDidFinishLoading(connection: NSURLConnection!)     {         println("请求成功2！");     } }