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我正在开发一个应用程序，我必须检查互联网连接。我正在使用两个文件 Reachability.h 和 Reachability.m。现在我必须在互联网不工作时显示警报。

但是，当我的观察者检查互联网时，它会多次显示警报视图。有时它会显示更多 9-10 次警报。我的代码在这里：

在 .h 文件中

Reachability* internetReachable;
    Reachability* hostReachable;
    NetworkStatus internetStatus;

在 .m 文件中

        internetReachable = [[Reachability reachabilityForInternetConnection] retain];
        [internetReachable startNotifier];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];
        hostReachable = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];
        [hostReachable startNotifier];



- (void) checkNetworkStatus:(NSNotification *)notice    
     {
        internetStatus = [internetReachable currentReachabilityStatus];

        if (internetStatus != NotReachable){
            NSLog(@"internet is on");

        }
        else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error!" message:@"Server not connected or down!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
            [alert release];
            internetCount++;
        }           
}

此代码在委托中，同样我在其他必须检查互联网的课程中使用此代码

请帮助

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1 回答 1

2

我不使用可达性，因为我遇到了像你这样的问题，所以我创建了自己的实现。只需导入下面的头文件，然后调用[self networkIsReachable]以检查互联网连接。

    #import <netinet/in.h>
    - (BOOL)networkIsReachable 
    {
        struct sockaddr_in zeroAddress;
        bzero(&zeroAddress, sizeof(zeroAddress));
        zeroAddress.sin_len = sizeof(zeroAddress);
        zeroAddress.sin_family = AF_INET;

        SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
        SCNetworkReachabilityFlags flags;
        BOOL gotFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
        CFRelease(defaultRouteReachability);
        if (!gotFlags) {
            return NO;
        }
        BOOL isReachable = flags & kSCNetworkReachabilityFlagsReachable;

        BOOL noConnectionRequired = !(flags & kSCNetworkReachabilityFlagsConnectionRequired);
        if ((flags & kSCNetworkReachabilityFlagsIsWWAN)) {
            noConnectionRequired = YES;
        }

        return (isReachable && noConnectionRequired) ? YES : NO;
    }
于 2011-07-10T18:22:21.603 回答