我使用Reachability从AppDeveloperLibrary检查互联网连接，代码如下:+(BOOL)reachable{Reachability*r=[ReachabilityreachabilityForInternetConnection];NetworkStatusinternetStatus=[rcurrentReachabilityStatus];Reachability*r1=[ReachabilityreachabilityForLocalWiFi];NetworkStatusinternetStatus1=[r1currentReachabilityStatu