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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

//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

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

//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

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！");
    }
}