//利用AFN测试网络连接
// MARK:  网络检测
AFNetworkReachabilityManager*manager = [AFNetworkReachabilityManagersharedManager];
[managerstartMonitoring];
[managersetReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatusstatus) {

/**
    AFNetworkReachabilityStatusUnknown= -1,
    AFNetworkReachabilityStatusNotReachable= 0,
    AFNetworkReachabilityStatusReachableViaWWAN= 1,
    AFNetworkReachabilityStatusReachableViaWiFi= 2,
**/

switch(status) {
            case -1:
             break;
            case AFNetworkReachabilityStatusNotReachable:
            //无法连接
            NSLog(@"无法连接");
            //添加遮罩警示信息
            [SVProgressHUDsetMinimumDismissTimeInterval:1];
            [SVProgressHUDshowErrorWithStatus:@"网络连接失败"];
       [SVProgressHUDsetDefaultMaskType:SVProgressHUDMaskTypeBlack];
            break;

            case1:
            //通过WWAN连接
            break;
            case2:
            //通过WIFI连接
            break;
        default:
            break;
        }
    }];