问iOS可达性未知矩

EN

Reachability *internetReachable;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{   
    // Set up Reachability
    internetReachable = [Reachability reachabilityForInternetConnection];

    // check for internet connection
    [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(checkNetworkStatus:)
                                                 name:kReachabilityChangedNotification object:nil];

    [internetReachable startNotifier];

- (void)checkNetworkStatus:(NSNotification *)notice {
    // called after network status changes

    if ( connected]) {
       // Your code HERE!
    }

}

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