Question

I need to show/hide a UITableView in some situations .But it is running absolutely fine sometimes.But sometimes tableView is not hidden.

If array data is present I’m filling it in UITableView.But if the array is null I m displaying a label with text “Data not found”..This is working perfectly ,but if I repeatedly do it then on my TableView’s data labels text is getting displayed without hiding the tableView..Couldn’t understand where I m going wrong..

This is the code I m writing…

if([arr count]==0)
{
    lblError.text=@"";
    lblError  = [[UILabel alloc] init];
    [lblError setFrame:CGRectMake(0,390,320,200)];
    lblError.textAlignment=UITextAlignmentLeft;
    lblError.backgroundColor = [UIColor clearColor];
    lblError.text = @"Results not found";
    lblError.textColor = [UIColor redColor];
    lblError.shadowColor = [UIColor blackColor];
    lblError.font = [UIFont fontWithName:@"Verdana-Italic" size:15];      
    [self.view addSubview:lblError];
    tableView.hidden=YES;
    [tableView removeFromSuperview];
    tableView=nil;

 }
else
{
     sections=[[NSMutableArray alloc] init];
    for(int s=0;s<1;s++)
    {
        NSMutableArray *section=[[NSMutableArray alloc] init];
        for(int i=0;i<[arr1 count];i++)
        {
            Item *item=[[Item alloc] init];
            NSString *name=[[arr objectAtIndex:i]objectForKey:@"Name"];
            item.Name=name;
            [section addObject:item];

        }
        [sections addObject:section];

    }
    tableView=[[UITableView alloc]initWithFrame:CGRectMake(0,430,320,200) style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;
    [self.view addSubview:tableView];  
    [tableView release];

}

Answer 1

I have solved it by fist allocating tableView’s delegate and dataSource to nil and then creating it again

tableView.delegate = nil;
tableView.dataSource = nil;

if([arr count]==0)
{
lblError.text=@"";
lblError  = [[UILabel alloc] init];
[lblError setFrame:CGRectMake(0,390,320,200)];
lblError.textAlignment=UITextAlignmentLeft;
lblError.backgroundColor = [UIColor clearColor];
lblError.text = @"Results not found";
lblError.textColor = [UIColor redColor];
lblError.shadowColor = [UIColor blackColor];
lblError.font = [UIFont fontWithName:@"Verdana-Italic" size:15];      
[self.view addSubview:lblError];
tableView.hidden=YES;
[tableView removeFromSuperview];
tableView=nil;

}
else
{
 sections=[[NSMutableArray alloc] init];
for(int s=0;s<1;s++)
{
    NSMutableArray *section=[[NSMutableArray alloc] init];
    for(int i=0;i<[arr1 count];i++)
    {
        Item *item=[[Item alloc] init];
        NSString *name=[[arr objectAtIndex:i]objectForKey:@"Name"];
        item.Name=name;
        [section addObject:item];

    }
    [sections addObject:section];

}
tableView=[[UITableView alloc]initWithFrame:CGRectMake(0,430,320,200) style:UITableViewStylePlain];
tableView.delegate = self;
tableView.dataSource = self;
[self.view addSubview:tableView];  
[tableView release];

}