iOS开发——网络编程Swift篇&（二）同／异&步请求

同／异&步请求

同步：

 1     // MARK: - 同步请求
 2     func httpSynchronousRequest()
 3     {
 4         //创建NSURL对象
 5         var url:NSURL! = NSURL(string: "http://m.weather.com.cn/data/101010100.html")
 6
 7         //创建请求对象
 8         var urlRequest : NSURLRequest = NSURLRequest(URL: url)
 9
10         //响应对象
11         var response:NSURLResponse?
12
13         //错误对象
14         var error:NSError?
15
16         //发出请求
17         var data:NSData? = NSURLConnection.sendSynchronousRequest(urlRequest, returningResponse: &response, error: &error)
18
19         if (error != nil)
20         {
21             println(error?.code)
22             println(error?.description)
23         }else
24         {
25             var jsonString = NSString(data: data!, encoding: NSUTF8StringEncoding)
26
27             println(jsonString)
28         }
29     }

异步：、

 1     // MARK: - 异步请求
 2     func httpAsynchronousRequest()
 3     {
 4         //创建NSURL对象
 5         var url:NSURL! = NSURL(string: "http://m.weather.com.cn/data/101010100.html")
 6
 7         //创建请求对象
 8         var urlRequest : NSURLRequest = NSURLRequest(URL: url)
 9
10         //网络连接对象
11 //        var conn : NSURLConnection? =  NSURLConnection(request: urlRequest, delegate: self)?
12
13          //2015年5月2后修改
14         var conn : NSURLConnection? =  NSURLConnection(request: urlRequest, delegate: self)
15
16         conn?.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSRunLoopCommonModes)
17
18         //执行
19         conn?.start()
20     }