Question

some times my app crashed by showing * Collection was mutated while being enumerated . This is occurring in same line of code all the time.please help me on this issue. i stuck on this. the app is crashing at pushing view controller line of my code.but it is not frequent one. my error console

Terminating app due to uncaught exception ‘NSGenericException’, reason: ‘* Collection CALayerArray: 0x1030c730 was mutated while being enumerated.
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my code:

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
 ServiceDetails *service=[[ServiceDetails  alloc] initWithNibName:@"ServiceDetails"   bundle:nil];  
    CompanyListingForm *list=[[CompanyListingForm  alloc]initWithNibName:@"CompanyListingForm" bundle:nil];
[category_company_text resignFirstResponder];
if(viewHoldingTable)
{
    [viewHoldingTable removeFromSuperview];
}
if (category_clicked_flag==0) {
    if (location_or_cat_com==0) {
        NSMutableArray *get=[district_array objectAtIndex:indexPath.row];
        locationid=[[get objectAtIndex:0]intValue];
        [location_textfield resignFirstResponder];
        location_textfield.text=[get objectAtIndex:1];
    }
    else
    {
        if (draggingView) {
            [draggingView removeFromSuperview];

        }
        if (viewHoldingTable) {
            [viewHoldingTable removeFromSuperview];
        }


        NSMutableArray *get=[company_array objectAtIndex:indexPath.row];
        category_company_text.text=[get objectAtIndex:1];



        service.ida=[NSString stringWithFormat:@"%d",[[get objectAtIndex:0] intValue]];

        service.idloc=[NSString stringWithFormat:@"%d",locationid];



        [self.navigationController pushViewController:service animated:YES];//getting error at this point.

        //[emer release];   
    }
}
else
{
    if (location_or_cat_com==0) {
        NSMutableArray *get=[district_array objectAtIndex:indexPath.row];
        locationid=[[get objectAtIndex:0]intValue];
        [location_textfield resignFirstResponder];
        location_textfield.text=[get objectAtIndex:1];
    }
    else
    {
        NSMutableArray *get=[category_array objectAtIndex:indexPath.row];
        category_company_text.text=[get objectAtIndex:1];
        int catid=[[get objectAtIndex:0]intValue];

        list.IDForLoc=[NSString stringWithFormat:@"%d",locationid];
        list.IDForCat=[NSString stringWithFormat:@"%d",catid];
        list.companydetails=[get objectAtIndex:1];
        [self.navigationController pushViewController:list animated:YES];//getting error at this point.

    } 
}
 [service release];
 [list release];
}

Answer 1

I think the problem is that you’re doing all this stuff to the interface at the same time as you’re asking to push a view controller. Try wrapping the pushViewController line in a dispatch_after block, with a delay of, say, .1 seconds, to give the other changes to the interface time to settle down. Or do it the other way: put the removeFromSuperview stuff into a delay. Even better, throw some kind of flag so that the stuff to be removed from the superview is removed later, on viewWillAppear. You don’t need to do it now; you’re about to hide to cover this view with the pushed view controller anyway.