refresh the uitableview contents - objective-c

Question

I have added uitableview in which I am trying to add custom UIButton. It is added successfully with this code:
image=[UIButton buttonWithType:UIButtonTypeCustom];
image.frame=CGRectMake(240, 7, 25, 25);
image.tag=101;
image2=[UIButton buttonWithType:UIButtonTypeCustom];
image2.frame=CGRectMake(240, 7, 25, 25);
image2.tag=102;
if ([outputlabel.text isEqualToString:#"Yes"]||[outputlabel.text isEqualToString:#"Yes"]) {
[image setImage:[UIImage imageNamed:#"tick.png"] forState:UIControlStateNormal];
[cell1.contentView addSubview:image];
[cell1.contentView bringSubviewToFront:image];
}
else
{
[image2 setImage:[UIImage imageNamed:#"cross.png"] forState:UIControlStateNormal];
[cell1.contentView addSubview:image2];
[cell1.contentView bringSubviewToFront:image2];
}
Its working fine at first. When table view reload it overlaps the uibutton old image. I am unable to refresh the whole table with new values. Someone has an idea what I am doing wrong in code.

Answer 1

Updated. Always Create content view for cell in cell == nil block. Use that contentview outside by the tag.. Then only it wont overlap and reuse ur cell perfectly..
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellIndentifier];
//Add your button here.. set the tag.
UIButton image=[UIButton buttonWithType:UIButtonTypeCustom];
image.frame=CGRectMake(240, 7, 25, 25);
image.tag=101;
}
UIButton *btn = (UIButton *)[cell.contentView viewWithTag:101];
if ([outputlabel.text isEqualToString:#"Yes"]||[outputlabel.text isEqualToString:#"Yes"])
{
[btn setImage:[UIImage imageNamed:#"tick.png"] forState:UIControlStateNormal];
}
else
{
[btn setImage:[UIImage imageNamed:#"cross.png"] forState:UIControlStateNormal];
}
Just do like this in cellForRowAtIndexPath.. It will helpful for you..

Answer 2

Basically, if we want to refersh the contents of tableview then need to use this reloadData. Did you try :-
[yourTableView reloadData];

Answer 3

Make sure you implement -cellForRowAtIndexPath:. Then refresh your tableViewCells by calling reloadRowsAtIndexPaths:withRowAnimation: on the tableView in question.
The tableView will in turn call cellForRowAtIndexPath, and you simply return the configured cells there.
If you have static cells, you can simply access whatever you need to change by hooking the controls up to an IBOutlet.

Answer 4

Try refreshing your cell's view using
[cell1.contentView setNeedsDisplay:TRUE];
every time you set the image.

Answer 5

I am suspecting, that you adding this images in -tableView:cellForRawAtIndexPath: method.
First of all - if you reusing cell with some reuse identifier, the Cell will stay in memory and will reused when it needed. It's means that all subviews of your cell will be retained. In this case you need to prepare cell for reusing every time. For example - remove all subViews of cell.
But better way, I recommend in case of less number of operations - to create subclass of UITableViewCell and add UIButton as a property of that cell.
Then you will only need to change this property depend of your condition.
if ([outputlabel.text isEqualToString:#"Yes"]) {
[cell1.button setImage:[UIImage imageNamed:#"tick.png"] forState:UIControlStateNormal];
}
else
{
[cell1.image setImage:[UIImage imageNamed:#"cross.png"] forState:UIControlStateNormal];
}
Of course, you button must be added in cell.contentView in the Cell initialiser. Usually it is method -initWithStyle:reuseIdentifier: of your custom cell .m file.