How can I show hud on the right time with shouldPerformSegueWithIdentifier?

Question

Background

1. Navigation Controller View
2. Table with cells having ftp information
3. Cell segue will connect to ftp server and show lists
4. shouldPerformSegueWithIdentifier will check if server's connection condition
5. if it's able to connect to the ftp server, it it will perform prepareForSegue

When a cell is clicked, I am showing HUD with "connecting..." and when it verifies, push to next page.

Problem : HUD doesn't show up right away and shows right before it's pushing to next view. Tried with various different HUD just in case, but fails. I am sure it's not the HUD.

Question : How can I start HUD right away upon click cell? Is shouldPerformSegueWithIdentifier a right place to start show HUD? I tried with dispatch_async or sync but I have to return YES/NO to should perform segue or not.

-(BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
{
    if([identifier isEqual:@"ConnectServer"])
    {
        self.HUD = self.prototypeHUD;
        self.HUD.textLabel.text = @"Connecting...";
        [self.HUD showInView:self.navigationController.view];
    NSManagedObject *obj = self.serverList[[self.tableView indexPathForSelectedRow].row];
        return [self checkServerConnection:obj];
    }
}

Answer 1

You can implement tableView:didSelectRowAtIndexPath: from the UITableViewDelegate protocol. This method gets called right when the user taps on a cell. You will then have to perform a check whether this cell should trigger your hud (assumed you have different kinds of cells, otherwise you can omit the check).

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   if (<check if the appropriate cell was tapped>) {
       self.HUD = self.prototypeHUD;
       self.HUD.textLabel.text = @"Connecting...";
       [self.HUD showInView:self.navigationController.view];

   } 
}