iOS-确定网络状态 (3G, WiFi )

AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
            {
                UIAlertController *ac = [UIAlertController alertControllerWithTitle:@"ESports" message:@"未识别的网络" preferredStyle:UIAlertControllerStyleAlert];
                [ac addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil]];
                break;
            }
               
            case AFNetworkReachabilityStatusNotReachable:
            {
                UIAlertController *ac = [UIAlertController alertControllerWithTitle:@"ESports" message:@"未连接" preferredStyle:UIAlertControllerStyleAlert];
                [ac addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil]];
                break;
            }
            case AFNetworkReachabilityStatusReachableViaWWAN:
               
            {
                UIAlertController *ac = [UIAlertController alertControllerWithTitle:@"ESports" message:@"您确定要使用移动网络?" preferredStyle:UIAlertControllerStyleAlert];
                [ac addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil]];
                break;
            }
            case AFNetworkReachabilityStatusReachableViaWiFi:
               
            {
                UIAlertController *ac = [UIAlertController alertControllerWithTitle:@"ESports" message:@"WiFi环境" preferredStyle:UIAlertControllerStyleAlert];
                [ac addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil]];
                break;
            }
            default:
                break;
        }
    }];
    // 开始监听
    [manager startMonitoring];