custom UITableViewCell know what cell was a check box modified - ios

Question

I have a custom cell that have a check box,
all is working fine, the checkboxes get check according to a dictionary that I pass to my subclassed UITableViewCell,
but now I need to pass to the class that have the table view the exact cell that my check box was modified so I can set my mutable dictionary with the new checked or unchecked state for that particular cell,
So how to do this?, shall I use a delegate?, this is fine, but the question is, how do I know what cell was my check box modified at?

Answer 1

You can use a delegate like this...
MyCell.h
#protocol MyCellDelegate <NSObject>
-(void)cellCheckBoxWasChanged:(MyCell *)cell;
#end
#interface MyCell : NSObject
#property (nonatomic, weak) id <MyCellDelegate> delegate;
#end
MyCell.m
#implementation MyCell
- (void)checkBoxChanged
{
[self.delegate cellCheckBoxWasChanged:self];
}
#end
Then to find the index you can do...
TableViewController.m
- (void)cellCheckBoxWasChanged:(MyCell *)cell
{
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
// do something to your array.
}

Answer 2

Why don't you pass the UITableViewCell also in the delegate method as self.
So with that cell, you could get the indexpath by
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

Answer 3

set the tag Value of each Checkboxes depending on the cells Indexpath in the cellForRowAtIndexPath: method.
UIButton *checkboxes = customCell.checkButton
[checkboxes setTag:indexPath.row];
then in buttons action method.
check the senders.Tag value to get the exact row of the button pressed
UITableViewCell *cell = [tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:sender.tag inSection:0]];

Answer 4

you can do this -
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
if (cell == nil)
{
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
if([[[Usercontacts objectAtIndex:indexPath.row]objectForKey:#"isChecked"]isEqualToString:#"NO"])
{
[checkUncheckBtn setImage:[UIImage imageNamed:#"unchecked box.png" ]forState:UIControlStateNormal];
checkUncheckBtn.tag=1;
}
else
{
[checkUncheckBtn setImage:[UIImage imageNamed:#"checked box.png" ]forState:UIControlStateNormal];
checkUncheckBtn.tag=2;
}
[checkUncheckBtn addTarget:self action:#selector(checkUncheckBtnPressed:) forControlEvents:UIControlEventTouchUpInside];
return cell;
}
and when you perform checkUncheckBtnPressed: method it looks like
-(void)checkUncheckBtnPressed:(id)sender
{
UIButton *btn=(UIButton*)sender;
UITableViewCell *cell =(UITableViewCell *) [sender superview] ;
NSIndexPath *_indxpath = [createGroupContactsTableView indexPathForCell:cell];
if(btn.tag==1)
{
[btn setImage:[UIImage imageNamed:#"checked box.png" ]forState:UIControlStateNormal];
btn.tag=2;
[[Usercontacts objectAtIndex:_indxpath.row]setObject:#"YES" forKey:#"isChecked"];
}
else
{
[btn setImage:[UIImage imageNamed:#"unchecked box.png" ]forState:UIControlStateNormal];
btn.tag=1;
[[Usercontacts objectAtIndex:_indxpath.row]setObject:#"NO" forKey:#"isChecked"];
}
}

Answer 5

Here's an alternative to having the Cells listen to events from the checkBoxes and forward them to the UITableViewController using the delegate pattern:
Have the UITableViewController listen to events from the checkBoxes and use the following code to determine the NSIndexPath of the cell:
#implementation UITableView (MyCategory)
-(NSIndexPath*)indexPathOfCellComponent:(UIView*)component {
if([component isDescendantOfView:self] && component != self) {
CGPoint point = [component.superview convertPoint:component.center toView:self];
return [self indexPathForRowAtPoint:point];
}
else {
return nil;
}
}
#end