选择提示框UIAlertController 和网络状态判断AFNetworking

// 选择提示框
            DownloadView *vc = [[DownloadView alloc] initWithFrame:CGRectMake(, , SCREEN_WIDTH, SCREEN_HEIGHT)];
            [vc show];

            UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
                                                                                     message:@"当前GPRS网络,确定要下载吗？"
                                                                              preferredStyle:UIAlertControllerStyleAlert ];
            //添加取消到UIAlertController中
            UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                NSLog(@"选择了取消");
            }];
            [alertController addAction:cancelAction];

            //添加确定到UIAlertController中
            UIAlertAction *OKAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                NSLog(@"选择了确定");
            }];
            [alertController addAction:OKAction];

            [self presentViewController:alertController animated:YES completion:nil];

            // 网络状态
            [[AFNetworkReachabilityManager sharedManager] startMonitoring];
            [[AFNetworkReachabilityManager sharedManager ] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
                switch (status) {
                    case -:
                        NSLog(@"未知网络");
                        break;
                    case :
                        NSLog(@"网络不可达");
                        break;
                    case :

                        NSLog(@"GPRS网络");
                        break;
                    case :
                        NSLog(@"wifi网络");
                        break;
                    default:
                        break;
                }
                if(status ==AFNetworkReachabilityStatusReachableViaWWAN || status == AFNetworkReachabilityStatusReachableViaWiFi)
                {
                    NSLog(@"有网");
                }else
                {
                    NSLog(@"没有网");
                    UIAlertController *notNetWorking = [UIAlertController alertControllerWithTitle:@"提示"
                                                                                           message:@"网络失去连接"
                                                                                    preferredStyle:UIAlertControllerStyleAlert ];
                    //添加取消到UIAlertController中
                    UIAlertAction *cancelClick = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                        NSLog(@"选择了取消");
                    }];
                    [notNetWorking addAction:cancelClick];
                    [self presentViewController:notNetWorking animated:YES completion:nil];
                }
            }];