学步园

判断当前网络是否存在

-(BOOL)isExistenceNetwork {     

BOOL isExistenceNetwork;     

Reachability *r = [Reachability reachabilityWithHostName:@"http://www.code4app.com"];     

switch ([r currentReachabilityStatus]) {         

case NotReachable:             

             isExistenceNetwork=FALSE;             

             break;         

case ReachableViaWWAN:

             isExistenceNetwork=TRUE;

             break;

case ReachableViaWiFi:

             isExistenceNetwork=TRUE;

             break;     }           

return isExistenceNetwork; }