判读是3g还是Wi-Fi

导入#import"Reachability.h"

Reachability *reachbility=[Reachability reachabilityWithHostName:@"www.baidu.com"]; NetworkStatus status=[reachbility currentReachabilityStatus];

NSString *net;

//使用 WiFi 网络连接

if (status==ReachableViaWiFi)

{

net = @"wifi";

}

else if(status ==ReachableViaWWAN)

{net = @"3g";}