响应不正确 - WWAN的可达性 [英] Incorrect Response - Reachability For WWAN

问题描述

在检查iPAD 3 WiFi + Cellular的可达性（网络可用性）时，我遇到了下面提到的场景中发生的奇怪问题。

While checking for reachability(network availability) of an iPAD 3 WiFi+Cellular, I ran into across a weird issue that happened in the below mentioned scenario.

• 为了检查网络可用性，我使用了 Apple
  reachability 的示例代码。


• 以下代码用于检查WiFi或WWAN的可用性。

• To check network availability I have used Apple sample code for reachability.
• The following code was implemented to check availability of WiFi or WWAN.

`

- (BOOL)networkCheck
 {
    Reachability *wifiReach = [Reachability reachabilityForInternetConnection];
    NetworkStatus netStatus = [wifiReach currentReachabilityStatus];

    switch (netStatus)
    {
        case NotReachable:
        {
            NSLog(@"%@",@"NETWORKCHECK: Not Connected");    
            return false;
            break;
        }
        case ReachableViaWiFi:
        {
            NSLog(@"%@",@"NETWORKCHECK: Connected Via WiFi");       
            return true;
            break;
        } 
        case ReachableViaWWAN:
        {
            NSLog(@"%@",@"NETWORKCHECK: Connected Via WWAN");
            return true;
            break;
        }
    }
    return false;
 }

`

• 在iPAD&中没有SIM卡的情况下还有
  无WiFi连接，上面的方法执行ReachableViaWWAN案例，
  似乎完全不正确因为没有SIM或任何其他
  WWAN网络可用。

• In a scenario when there was NO SIM in the iPAD & also there was No-WiFi connection, the above method executes ReachableViaWWAN case, which seems totally incorrect as there is NO SIM or any other WWAN network available.

为了克服这个问题，建议采用一种解决方法（或者我应该说是黑客攻击）。实施如下：
向可靠的主机发送请求&检查其响应。

To Overcome this issue a workaround (or should I say a hack) was suggested & implemented as follows: Send a request to a reliable host & check for its response.

case ReachableViaWWAN:
    {
        NSLog(@"%@",@"NETWORKCHECK: Connected Via WWAN");
        NSData *responseData = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"www.google.com"]] returningResponse:nil error:nil];
        if (responseData != nil)
        {
            return true;
            break;
        }
        else
        {
            return false;
            break;
        }

    }

我有几个问题：

1. 这可能听起来很不寻常，但硬件
   或iOS出现问题，即使没有SIM卡，它也是ReachableViaWWAN在
   设备中？


2. 这个问题是否有更好的解决方案（比上面提到的解决方法）？

推荐答案

我不知道你的代码中是否有bug，但你可以尝试使用这个来检查连接。来自此问题的
。

I don't know if it is a bug in your code but you can try using this to check the connection. from this question.

并检查连接性，您可以创建如下方法：

and for check the connectivity you can create a method like this:

 -(BOOL)connected
  {
     Reachability *reachability = [Reachability reachabilityForInternetConnection];
     NetworkStatus networkStatus = [reachability currentReachabilityStatus];
     return !(networkStatus == NotReachable);
 }

以及您想要检查连接的地方

and wherever you want to check the connection just

if (![self connected]) {
//THERE IS NO WWAN OR WIFI connection
}else{
// connected. 
}

它适用于我。

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