既然上篇文章說到了網絡的判斷，那這篇文章就來講一下網絡的請求吧，如有不對，敬請糾正
請求方式:GET、POST、SOAP
GET->構建不可變的請求對象
1.構建網絡資源路徑
NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
2.構建請求對象
NSURLRequest *request = [NSURLRequest requestWithURL:url];
3.1 構建連接對象(同步：會造成界面假死)
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
3.2 構建連接對象(異步：多線程)推薦用法
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[conn start];
實現NSURLConnectionDataDelegate協議方法
已經接收到響應頭
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
開始接收數據:可能調用多次
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
連接失敗
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
連接已完成
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
POST->構建可變的請求對象
1 設置請求方式
[request setHTTPMethod:@"POST"];
2 設置請求內容
NSString *body = [NSString stringWithFormat:@"mobileCode=%@&userID=",self.txtPhone.text];
NSData *bodyData = [body dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:bodyData];
3 設置請求頭
NSString *bodyLen = [NSString stringWithFormat:@"%i",[bodyData length]];
[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request addValue:bodyLen forHTTPHeaderField:@"Content-Length"];
構建連接對象同上，就不贅述來哈！