如何在xcode中使用可達性來評估Internet連接

Question

我是iphone的新手，我想知道如何在xcode中使用可達性。 我繼續閱讀“ 可達性”示例，並閱讀但了解它。 我創建了一個應用程序，並將Reachability.m和Reachability.h放入其中，但是我不知道如何使用它。

請指導我。 我想在運行應用程序時隨時檢查我的網絡連接並運行以下代碼：

if (isConnection)
{
NSLog(@"Connection Success")
}
else
NSLog(@"Connection has been lost")

Answer 1

你可以這樣做：

 Reachability *reachability = [Reachability reachabilityForInternetConnection];
 NetworkStatus internetStatus = [reachability currentReachabilityStatus];

現在，通過檢查其值來檢查internetStatus var。 這些值定義為：

typedef enum 
{
    // Apple NetworkStatus Compatible Names.
    NotReachable     = 0,
    ReachableViaWiFi = 2,
    ReachableViaWWAN = 1
} NetworkStatus;

因此，在您的情況下：

if (internetStatus == NotReachable)
{
   NSLog(@"Bazinga!");
}
else
{
   NSLog(@"Houston we have ignition");
}

Answer 2

下載可達性課程並遵循此代碼

internetReach = [[Reachability reachabilityForInternetConnection] retain];
[internetReach startNotifier];

然后，我們將設置在可達性中創建的NetworkStatus變量。

NetworkStatus netStatus = [internetReach currentReachabilityStatus];

最后，我們將在開關塊中使用netStatus。

switch (netStatus)
{            
    case ReachableViaWWAN:
    {
        break;
    }
    case ReachableViaWiFi:
    {
        break;
    }
    case NotReachable:
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"We are unable to make a internet connection at this time. Some functionality will be limited until a connection is made." delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alert show];   
        [alert release];
        break;
    }

}

- (void) reachabilityChanged: (NSNotification* )note
{
    Reachability* curReach = [note object];
    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);

    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    switch (netStatus)
    {
        case ReachableViaWWAN:
        {
            break;
        }
        case ReachableViaWiFi:
        {
            break;
        }
        case NotReachable:
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"We are unable to make a internet connection at this time. Some functionality will be limited until a connection is made." delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
            [alert show];   
            [alert release];
            break;
        }
    }
}