Change Image of UIButton in UITableView Cell Dynamically

Question

I add UIButton in the cell Dynamically and change UIButton image on click of UIBarButtonItem how i can change?

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"Display"] ; 
    [cell.textLabel setText:[NSString stringWithFormat:@"%@" ,[arrItemList objectAtIndex:indexPath.row]]];

    UIButton *btnCheck = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btnCheck.frame = CGRectMake(6.0f, 2.0f, 32.0f, 25.0f);
    [btnCheck setTitle:@"" forState:UIControlStateNormal]; 
    [btnCheck addTarget:self action:nil forControlEvents:UIControlEventTouchUpInside];
    [cell addSubview:btnCheck]; 

    return cell;
}
//Here IBAction for Bar Button Item
//when ever user click on BarButton then set the image of all btnCheck
-(IBAction)bbtnCheck:(id)sender
{
}

Can you show me your code, what have you tried or made till now? — Anoop Vaidya, Jan 01 '13 at 08:30
[bttnCheck setImage:unselectedImage forState:UIControlStateNormal]; — Anoop Vaidya, Jan 01 '13 at 08:47
i dont need to any action and any image at first time but when user click on Bar Button at that time i wont to set image on this all button which is generated dynamically. — Mihin, Jan 01 '13 at 08:52
Note that you're not allowing proper cell reuse since you're allocating a new button for a cell each time a cell is displayed. Secondly, you generally want to add cell subviews to the cell's contentView, not the cell itself. — Bill, Jan 01 '13 at 09:22
check this link http://stackoverflow.com/questions/650131/checkbox-in-iphone-application — Paras Joshi, Jan 01 '13 at 09:22
Are you attempting to change every cell's button or a specific cell's button when the bar button item is clicked? — Bill, Jan 01 '13 at 09:31
i try your code but till i am not able to set image on Button if i can set tag value at starting of loop then it will set only first button — Mihin, Jan 01 '13 at 11:33
The tag is set when the cell is created/dequeued. That line of code (i.e., btnCheck.tag = MY_BUTTON_TAG_NUMBER) should be in tableView:cellForRowAtIndexPath, which is called each time a cell is needed. — Bill, Jan 01 '13 at 19:59

Bill · Answer 1 · 2013-01-01T09:27:53.143

Assuming that your question is how to change the image of a button w/in every cell of your table when a bar button is clicked, I suggest the following:

Within tableView:cellForRowAtIndexPath, add:

btnCheck.tag = MY_BUTTON_TAG_NUMBER;

Then, when the bar button item is clicked, loop through the visible cells and use the button's tag to identify it and update its image.

-(IBAction)bbtnCheck:(id)sender {
 for (UITableViewCell *cell in self.tableView.visibleCells) {
   UIButton *button = [cell viewWithTag:MY_BUTTON_TAG_NUMBER];
   [button setImage:[UIImage imageNamed:SOME_NEW_IMAGE] forState:UIControlStateNormal];
  }
}

Murali · Answer 2 · 2013-01-01T09:22:37.950

0

In that bbtnCheck you have to get the instance of that tableView (i.e. particular cell)..Then after you can get buttons added on that particular cell.. Please Check this....

-(IBAction)bbtnCheck:(id)sender
{
     NSIndexPath *indexpath = [NSIndexPath indexPathForRow:YourRow inSection:YourSection]; // you have to set Row and Section according to your requirement
     UITableViewCell *cellNew = [self.tblComments cellForRowAtIndexPath:indexpath];
    for (UIButton *btn in [cellNew.contentView subviews]) 
    {
        if ([btn isKindOfClass:[UIButton class]]) 
        {
            [btn setImage:[UIImage imageNamed:@"yourImage.png"] forState:UIControlStateNormal];
        }
    }    
}

edited Jan 01 '13 at 09:22

answered Jan 01 '13 at 08:53

Murali

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You won't be able to reference the button w/in the cell like that. – Bill Jan 01 '13 at 09:04
how i can access btnCheck in this method is it possible ?? – Mihin Jan 01 '13 at 09:12
@user1934408: use custom cell and add button into custom cell and give target to button in cellAtIndex... method, then you can get access like above... – Maulik Jan 01 '13 at 09:15
Looping through all subViews is wasteful and not specific. Just tag the button subview, as shown above. – Bill Jan 01 '13 at 09:32
That's one time too many already. And that number grows if/when other subviews are added in the future. You're also assuming that all buttons w/in the cell have the same behavior. – Bill Jan 01 '13 at 09:40

Change Image of UIButton in UITableView Cell Dynamically

2 Answers2