iOS可达性：主机方法问题

Question

我创建了一种方法来检查主机是否可以访问。我从苹果开发者网站下载了 Reachability 类（.h 和 .m）并导入到我的项目中。我已将 NSString 名称作为 URL（主机名）传递。主机名是 http://www.google.com。但是，无论我传递给此方法的主机名是什么，它总是返回 NO (connectToHost)。代码如下：

- (BOOL) checkHostAvailability:(NSString *)Name{
        BOOL connectToHost;
        hostReach = [[Reachability reachabilityWithHostName:Name] retain];
        [hostReach startNotifier];

        NetworkStatus hostStatus = [hostReach currentReachabilityStatus];
        NSLog(@"Name: %@", Name);
        NSLog(@"hostStatus is %@", hostStatus);

        if(hostStatus == NotReachable){
                NSLog(@"Here is the checkHostAvailability Method and host NOT reachable");
                connectToHost = NO;
       }else{
                NSLog(@"Here is the checkHostAvailability Method and host is reachable");
                connectToHost = YES;
       }
       return connectToHost;


}

经过几个小时的调查，我发现 NetworkStatus hostStatus 始终等于 null。我认为这就是该方法不起作用的原因。我花了8个小时找出这段代码的问题并搜索了这个网站，但我仍然找不到问题和解决方案。

请帮助并非常感谢。

Answer 1

从主机名中删除“http://”。

Answer 2

如果您想使用 http://www.google.com 作为主机，则可以传递“google.com”作为主机名。请勿包含 http://、结尾斜杠或结尾斜杠后面的任何内容。包含 www. 即可。

[Reachability reachabilityWithHostName:@"google.com"];

Answer 3

这是我用于所有连接检查的代码（请参见此处：iOS 开发者库-可达性），它对我来说工作得很好：

-(BOOL) hasConnection{

//check network status _ iphone settings
Reachability *internetReachability = [Reachability reachabilityForInternetConnection];
[internetReachability startNotifier];


NetworkStatus status=[internetReachability currentReachabilityStatus];
if (status == NotReachable) {
    NSLog(@"No internet");
    //[internetReachability stopNotifier];
    return NO;
}else {
    NSLog(@"Internet is ON");
   // [internetReachability stopNotifier];

    //check internet connection _reachable path

    Reachability *hostReachable=[Reachability   reachabilityWithHostName:@"www.apple.com"];
    BOOL connectionRequired =[hostReachable connectionRequired];
    NSLog(@"%hhd",connectionRequired);

    [hostReachable startNotifier];

    Reachability *wifiReachability=[Reachability reachabilityForLocalWiFi];
    [wifiReachability startNotifier];

    NetworkStatus hostStatus=[hostReachable currentReachabilityStatus];
    if(hostStatus == NotReachable){
        NSLog(@"No internet connection");
        [hostReachable stopNotifier];
        return NO;
    }else{
        NSLog(@"Connection is ok");
        [hostReachable stopNotifier];
        return YES;
    }
}
}