Question

我正在使用Apple的Reachability示例代码来检测网络连接更改，并想知道一旦应用程序返回到前台，人们将如何获得准确的网络状态。

在我目前可见的UIViewController中，我正在注册为kReachabilityChangedNotification的观察者（与Reachability示例代码相同），并且还在侦听UIApplicationWillEnterForegroundNotification和UIApplicationWillResignActiveNotification事件。

在我当前可见的UIViewController中，就在应用程序暂停之前：

// While the app is in the foreground, I configure SCNetworkReachabilitySetCallback 
// At this point, I have lost connectivity.

[reachability startNotifier];

// this returns NotReachable, as expected
NetworkStatus status = [reachability currentReachabilityStatus];

现在暂停应用并更改wifi设置（更改网络设置以建立连接）

After app resume: (in the UIApplicationWillEnterForegroundNotification handler)
// this still returns NotReachable even though I now have connectivity.
NetworkStatus status = [reachability currentReachabilityStatus];

关于我做得不对的任何建议？

Answer 1

应用程序恢复后，请尝试以下操作：

//Reachability is the class from Apple's Reachability sample

Reachability *reachability = [Reachability reachabilityForLocalWiFi];

NetworkStatus netStatus = [reachability currentReachabilityStatus];

if (netStatus == NotReachable)
{
    NSLog(@"Not Reachable");
} else
{
    NSLog(@"Reachable");
}

iOS可访问性和应用程序暂停/恢复行为

1 个答案: