?// 网络变化消息
[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(checkNetwork) name: kReachabilityChangedNotification object: nil];
Reachability *reach = [Reachability reachabilityWithHostname: @“www.baidu.com"];
// 开始监听
[reach startNotifier];?
AFNetworking实时监测网络连接,布布扣,bubuko.com
原文：http://www.cnblogs.com/jz319/p/3842497.html