这里是示例代码的链接http://developer.apple.com/library/ios/#samplecode/MVCNetworking/Introduction/Intro.html下面是文件NetworkManager.m中的代码片段+(NetworkManager*)sharedManager//Seecommentinheader.{staticNetworkManager*sNetworkManager;//Thiscanbecalledonanythread,sowesynchronise.Weonlydothisin//thesNetworkManagerca