ios – 在SCNetworkReachabilityCreateWithAddress中零sockaddr_in是什么意思？

+(Reachability *)reachabilityForInternetConnection 
{   
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress,sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    return [self reachabilityWithAddress:&zeroAddress];
}

和AFNetworkReachabilityManager有

+ (instancetype)sharedManager {
    static AFNetworkReachabilityManager *_sharedManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken,^{
        struct sockaddr_in address;
        bzero(&address,sizeof(address));
        address.sin_len = sizeof(address);
        address.sin_family = AF_INET;

        _sharedManager = [self managerForAddress:&address];
   });

这意味着两者都建议这是检查互联网连接的正确方法.

但我认为只关心我们连接到Wifi路由器,它并不关心Wifi路由器是否可以访问互联网,对吧？

有人在How to check for network reachability on iOS in a non-blocking manner?说

这是真的吗？