Swift - 使用NSURL进行数据的提交和获取（POST与GET）

2015-03-24 发布：hangge 阅读：12815

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://www.hangge.com/"
    var url:NSURL!
    url = NSURL(string:urlString)
    let request = NSMutableURLRequest(URL:url)
    let body = "score=\(score)&user=\(userid)"
    //编码POST数据
    let postData = body.dataUsingEncoding(NSUTF8StringEncoding)
    //保用 POST 提交
    request.HTTPMethod = "POST"
    request.HTTPBody = postData
        
    //响应对象
    var response:NSURLResponse?
        
    do{
        //发出请求
        let received:NSData? = try NSURLConnection.sendSynchronousRequest(request,
            returningResponse: &response)
        let datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)
        print(datastring)
            
    }catch let error as NSError{
        //打印错误消息
        print(error.code)
        print(error.description)
    }
}

（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://www.hangge.com/savescore.php"
        var url:NSURL!
        url = NSURL(string:urlString)
        let request = NSMutableURLRequest(URL:url)
        let body = "score=\(score)&user=\(userid)"
        //编码POST数据
        let 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()
        print(conn)
    }
    
    func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse)
    {
        print("请求成功！");
        print(response)
    }
    
    func connection(connection: NSURLConnection, didReceiveData data: NSData)
    {
        print("请求成功1！");
        let datastring = NSString(data:data, encoding: NSUTF8StringEncoding)
        print(datastring)
    }
    
    func connectionDidFinishLoading(connection: NSURLConnection)
    {
        print("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://www.hangge.com/getscore.php?user=\(user)"
    var url:NSURL!
    url = NSURL(string:urlString)
    let request = NSMutableURLRequest(URL:url)
    request.HTTPMethod = "GET"
        
    //响应对象
    var response:NSURLResponse?
        
    do{
        //发出请求
        let received:NSData? = try NSURLConnection.sendSynchronousRequest(request,
            returningResponse: &response)
        let datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)
        print(datastring)
            
    }catch let error as NSError{
        //打印错误消息
        print(error.code)
        print(error.description)
    }
}

（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)
        let request = NSMutableURLRequest(URL:url)
        
        request.HTTPMethod = "GET"
        var conn:NSURLConnection!
        conn = NSURLConnection(request: request,delegate: self)
        conn.start()
        print(conn)
    }
    
    func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse)
    {
        print("请求成功！");
        print(response)
    }
    
    func connection(connection: NSURLConnection, didReceiveData data: NSData)
    {
        print("请求成功1！");
        let datastring = NSString(data:data, encoding: NSUTF8StringEncoding)
        print(datastring)
        
        //解析 JSON 数据
        do {
            let json : AnyObject! = try NSJSONSerialization.JSONObjectWithData(data,
                options:NSJSONReadingOptions.AllowFragments)
            
            let score = json.objectForKey("score") as! Int
            print(score)
        }catch let error as NSError{
            //打印错误消息
            print(error.code)
            print(error.description)
        }
    }
    
    func connectionDidFinishLoading(connection: NSURLConnection)
    {
        print("请求成功2！");
    }
}

2楼

2016-02-22 17:32

小伟伟

请问航哥怎么将手机app中的数据传给某个特定的服务器，或者如何获得服务器中特定的资源？有没有什么实例？

站长回复：
可以参考我原来写的这篇文章：Swift - 使用NSURLSession加载数据、下载、上传文件（http://www.hangge.com/blog/cache/detail_780.html）
1楼

2015-10-18 21:16

木头人

麻烦航哥更新一下这个吧NSURLConnection 谢谢了十分感谢

站长回复：
代码已更新。不过自iOS9起建议改用NSURLSession。具体用法可以在站内搜索：NSURLSession