Reachability(验证网络是否可用)

提供链接网络地址,就可以验证是否可以连通

Reachability * reach = [Reachability reachabilityWithHostname:@"www.baidu.com"];

reach.reachableBlock = ^(Reachability*reach) {

        NSLog(@"网络可用!");

};

reach.unreachableBlock = ^(Reachability*reach) {

        NSLog(@"网络不可用!");

};

 // 开始监听

[reach startNotifier];