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我在Xcode 4上收到语义警告: *在这个函数之外,'struct sockaddr_in'的声明将不可见* 结构似乎在netinet/in.h中声明

该警告已在Reachability.h上标记,它是我从Apple示例下载的类.

#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>

typedef enum {
    NotReachable = 0,
    ReachableViaWiFi,
    ReachableViaWWAN
} NetworkStatus;
#define kReachabilityChangedNotification @"kNetworkReachabilityChangedNotification"

@interface Reachability: NSObject
{
    BOOL localWiFiRef;
    SCNetworkReachabilityRef reachabilityRef;
}

//reachabilityWithHostName- Use to check the reachability of a particular host name. 
+ (Reachability*) reachabilityWithHostName: (NSString*) hostName;

//reachabilityWithAddress- Use to check the reachability of a particular IP address. 
+ (Reachability*) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;

//reachabilityForInternetConnection- checks whether the default route is available.  
//  Should be used by applications …

使用时Reachability.h- Apple的代码处理iOS上的连接:

+ (Reachability*) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;

我收到以下警告:

Declaration of 'struct sockaddr_in' will not be visible outside of this function