iOS开发——网络编程Swift篇&（六）异步Post方式

异步Post方式

 1      // MARK: - 异步Post方式
 2     func asynchronousPost()
 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 request : NSMutableURLRequest = NSMutableURLRequest(URL: url, cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy, timeoutInterval: 10)
 9
10         request.HTTPMethod = "POST"//设置请求方式为POST，默认为GET
11
12         var str:String = "type=focus-c";//设置参数
13         var data:NSData = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!
14         request.HTTPBody = data;
15
16         //连接服务器
17         var connection = NSURLConnection(request: request, delegate: self)
18     }
19
20
21
22     // MARK: - NSURLConnectionDataDelegate
23     func connection(connection: NSURLConnection, willSendRequest request: NSURLRequest, redirectResponse response: NSURLResponse?) -> NSURLRequest?
24     {
25         //将要发送请求
26         return request
27     }
28
29     func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse)
30     {
31         //接收响应
32     }
33
34
35     var jsonData:NSMutableData =  NSMutableData()
36     func connection(connection: NSURLConnection, didReceiveData data: NSData)
37     {
38         //收到数据
39         self.jsonData.appendData(data)
40     }
41
42     func connection(connection: NSURLConnection, needNewBodyStream request: NSURLRequest) -> NSInputStream?
43     {
44         //需要新的内容流
45         return request.HTTPBodyStream
46     }
47
48     func connection(connection: NSURLConnection, didSendBodyData bytesWritten: Int, totalBytesWritten: Int, totalBytesExpectedToWrite: Int)
49     {
50         //发送数据请求
51     }
52
53     func connection(connection: NSURLConnection, willCacheResponse cachedResponse: NSCachedURLResponse) -> NSCachedURLResponse?
54     {
55         //缓存响应
56         return cachedResponse
57     }
58
59     func connectionDidFinishLoading(connection: NSURLConnection)
60     {
61         //请求结束
62
63         var jsonString = NSString(data: self.jsonData, encoding: NSUTF8StringEncoding)
64
65         println(jsonString)
66
67
68         let dict:AnyObject? = NSJSONSerialization.JSONObjectWithData(self.jsonData, options: NSJSONReadingOptions.AllowFragments, error: nil)
69
70
71         //已下代码 重新修订
72 //        var dic = dict as NSDictionary
73 //
74 //        let weatherinfoDic = dic.objectForKey("weatherinfo") as? NSDictionary
75 //        let city = weatherinfoDic?.objectForKey("city") as? String
76 //        let date_y = weatherinfoDic?.objectForKey("date_y") as? String
77 //        let temp1 = weatherinfoDic?.objectForKey("temp1") as? String
78 //
79 //        let alert = UIAlertView(title: (city! + date_y!), message: temp1!, delegate: nil, cancelButtonTitle: "确定")
80 //        alert.show()
81
82
83         //2015年4月10号修改
84         if var dic = dict as? NSDictionary
85         {
86             let weatherinfoDic = dic.objectForKey("weatherinfo") as? NSDictionary
87             let city = weatherinfoDic?.objectForKey("city") as? String
88             let date_y = weatherinfoDic?.objectForKey("date_y") as? String
89             let temp1 = weatherinfoDic?.objectForKey("temp1") as? String
90
91             let alert = UIAlertView(title: (city! + date_y!), message: temp1!, delegate: nil, cancelButtonTitle: "确定")
92             alert.show()
93         }
94     }
95