ios - 如何在 xcode 中使用可达性来评估 Internet 连接

Question

我是 iphone 新手，我想知道如何在 xcode 中使用可达性。我继续阅读可达性示例并阅读它，但了解它。我创建了一个应用程序并将 Reachability.m 和 Reachability.h 放入其中，但我不知道如何使用它。

请指导我。我想在运行应用程序时随时检查我的网络连接并运行此代码：

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

Answer 1

你可以这样做：

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

现在internetStatus通过检查它的值来检查 var。这些值定义为：

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

所以，在你的情况下：

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

Answer 2

下载可达性类并遵循此代码

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

然后我们将设置在 Reachability 中创建的 NetworkStatus 变量。

NetworkStatus netStatus = [internetReach currentReachabilityStatus];

最后，我们将在 switch 块中使用 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;
        }
    }
}