如何在某些条件失败时停止推送segue-(void)prepareForSegue:(UIStoryboardSegue*)seguesender:(id)sender{internet*myclass=[[internetalloc]init];if([myclassconnectedToInternet]){if([[segueidentifier]isEqualToString:@"showShoping"]){_pass=@"shop";MyTabController*mvc=(MyTabController*)segue.destinationViewController;m