NSURL进行数据请求（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！");
}
}