Question

I am using a UITableView to show data, and by using customise button and delete function I am trying to delete selected row. But i want to put an alertview inside that function when UITableView is empty, and by using buttons inside the UIAlertView I am trying to navigate to main page and previous page according to conditions. But it’s getting crashed after UITableView is getting empty and I push the delete button with “Program received signal: “SIGABRT”.

My code looks like this:

    - (IBAction)DeleteButtonAction:(id)sender
    {   
        DMSAppDelegate *d = (DMSAppDelegate *)[[UIApplication sharedApplication] delegate];

        NSLog(@"Message From Custom Cell Received");

        if(d->newtableData.count != 0)
        {

            NSIndexPath *indexPath = [self.tablevieww2 indexPathForCell:(UITableViewCell *)[[[sender superview] superview] superview]];
            NSUInteger row = [indexPath row];
            [d->newtableDataQt removeObjectAtIndex:row];
            NSLog(@"data removed");
            [self.tablevieww2 reloadData];
        }   
        else
        {       
            UIAlertView *alertview=[[UIAlertView alloc] initWithTitle:@"hello" message:@"Warning!!: Table is empty" delegate:self cancelButtonTitle:@"Yes" otherButtonTitles:@"",@"No",nil];
            textfieldQty1 = [alertview textFieldAtIndex:0];
            textfieldQty1.keyboardType = UIKeyboardTypeNumberPad;
            textfieldQty1.keyboardAppearance = UIKeyboardAppearanceAlert;
            textfieldQty1.autocorrectionType = UITextAutocorrectionTypeNo;
            [alertview show];
            [alertview release];    
        }

    }

    - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
    {
        if (buttonIndex == 0) 
        {
            DMSViewController *bt=[[DMSViewController alloc]initWithNibName:nil bundle:nil];
            bt.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
            [self presentModalViewController:bt animated:YES];
        }
        else if (buttonIndex == 1)
        {
            NSString *newqty = [[NSString alloc] initWithFormat:@"%@",textfieldQty1.text];
            DMSAppDelegate *d= (DMSAppDelegate *)[[UIApplication sharedApplication] delegate];
            [d->newtableDataQt replaceObjectAtIndex:slCell1 withObject:(id)newqty];
            NSLog(@"tb%@",d->newtableDataQt);
            [self.tablevieww2 reloadData];  
            int total1=0;

            for ( int i=0 ; i < [d->newtableDataQt count];++i )
            {           
                NSString *string = [d->newtableDataQt objectAtIndex:i];

                NSLog(@"string%@",string);

                if ([string isEqualToString:@"0"])
                {

                }
                else
                {
                    NSLog(@"newArray%@",d->newtableDataPrice);
                    NSString *strP=[d->tableDataPrice objectAtIndex:i];
                    NSInteger sp=[strP integerValue];
                    NSInteger st=[string integerValue];
                    total1=total1+st*sp;
                    NSLog(@"total1%d",total1);
                }
            }

            NSString *newtotal1=[NSString stringWithFormat:@"%d",total1];
            DMSAppDelegate *d2 = (DMSAppDelegate   *) [[UIApplication sharedApplication] delegate];
            d2->totalD = [[NSString alloc] initWithString:newtotal1];
        }   
    }

    Please give me some solution. I am trying really hard from yesterday but not getting any success.
    Thanks in advance.
    @

Answer 1

You need to check two things:-

First:- if(d->newtableData.count != 0)
is the condition and you are not removing the items from newtableData you are removing it from newtableDataQt so thats why your else method is not getting called. because newtableData will never have count =0.

Second thing;-
one thing if your table is empty means that newtableDataQt will contain no values , it will be empty.Now when you click on the delete button, the alert view appears , after that if you click whatever button at index 1 then in your code you have written :-

[d->newtableDataQt replaceObjectAtIndex:slCell1 withObject:(id)newqty];

so newtableDataQt has already be empty before and now you are using it.This might be the reason of crash.

try

if( [newtableDataQt count] >slCell1)
{    [d->newtableDataQt replaceObjectAtIndex:slCell1 withObject:(id)newqty];
}

I hope it might help you.