检查iPhone是否存在活动的互联网连接情况

Question

我想检查用户是否有活跃的互联网连接.这就是我实现它的方式.它似乎工作正常,但问题是它总是显示我的iPhone模拟器(uialert出现)没有连接,即使我的wifi打开或关闭.有谁知道我做错了什么？谢谢你的帮助!

Reachability *r= [Reachability reachabilityWithHostName:@"http://www.google.com"];
    NetworkStatus internetStatus= [r currentReachabilityStatus];

 if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN))
    {

        UIAlertView *alert= [[UIAlertView alloc] initWithTitle:@"No internet" message:@"No internet connection found. Please try again later"
                                                      delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }

 else {

 // execute code in app

 }

Answer 1

这就是我在我的应用程序中完成的方式:

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

if(internetStatus == NotReachable) {
    UIAlertView *errorView;

    errorView = [[UIAlertView alloc]
                 initWithTitle: NSLocalizedString(@"Network error", @"Network error")
                 message: NSLocalizedString(@"No internet connection found, this application requires an internet connection to gather the data required.", @"Network error")
                 delegate: self
                 cancelButtonTitle: NSLocalizedString(@"Close", @"Network error") otherButtonTitles: nil];

    [errorView show];
    [errorView autorelease];
}

它的作用是检查互联网连接,而不是它是否可以到达域.如果没有互联网连接(wifi或celluar),它将显示UIAlertView消息(本地化).