判断当前网络

- (void)testNetStatusByAF{

[[AFNetworkReachabilityManager sharedManager] startMonitoring];

[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

NSString *netStatus;

if (status==-1) {

NSLog(@"未知");

netStatus=@"未知";

}else if (status==0){

NSLog(@"无连接");

netStatus=@"无连接";

}else if (status==1){

NSLog(@"2/3G");

netStatus=@"2/3G";

}else if (status==2){

NSLog(@"Wifi");

netStatus=@"Wifi";

}

}];

}