How can I keep track of the index path of a button in a table view cell?

Question

I have a table view where each cell has a button accessory view. The table is managed by a fetched results controller and is frequently reordered. I want to be able to press

Answer 1

I had this same issue also and built a simple recursive method that works no matter how many views deep you triggering control is.

-(NSIndexPath*)GetIndexPathFromSender:(id)sender{

    if(!sender) { return nil; }

    if([sender isKindOfClass:[UITableViewCell class]])
    {
        UITableViewCell *cell = sender;
        return [self.tableView indexPathForCell:cell];
    }

    return [self GetIndexPathFromSender:((UIView*)[sender superview])];
}


-(void)ButtonClicked:(id)sender{
    NSIndexPath *indexPath = [self GetIndexPathFromSender:sender];
}

Answer 2

This stopped working with iOS 7; check out Mike Weller's answer instead

- (IBAction)clickedButton:(id)sender {
    UIButton *button = (UIButton *)sender;
    UITableViewCell *cell = (UITableViewCell *)button.superview;
    UITableView *tableView = (UITableView *)cell.superview;
    NSIndexPath *indexPath = [tableView indexPathForCell:cell];
}

Or shorter:

- (IBAction)clickedButton:(id)sender {
    NSIndexPath *indexPath = [(UITableView *)sender.superview.superview indexPathForCell:(UITableViewCell *)sender.superview];
}

Both are untested!

Answer 3

I have created one Method for getting indexPath, Hope this will help you.

Create Button Action (aMethod:) in cellForRowAtIndexPath

-(void) aMethod:(UIButton *)sender
{
    // Calling Magic Method which will return us indexPath.
    NSIndexPath *indexPath = [self getButtonIndexPath:sender];

    NSLog(@"IndexPath: %li", indexPath.row);
    NSLog(@"IndexRow: %li", indexPath.section);
}

// Here is the Magic Method for getting button's indexPath

-(NSIndexPath *) getButtonIndexPath:(UIButton *) button
{
    CGRect buttonFrame = [button convertRect:button.bounds toView:groupTable];
    return [groupTable indexPathForRowAtPoint:buttonFrame.origin];
}

Answer 4

I don't know why I need to call the method superview twice to get the UITableViewCell.

Update:

Thank for Qiulang, now I got it.

"That's because SDK now has added a private class called UITableViewCellContentView for UITableViewCell, which is button's superview now." – Qiulang

UIButton *button = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell *)button.superview.superview;
UITableView *curTableView = (UITableView *)cell.superview;
NSIndexPath *indexPath = [curTableView indexPathForCell:cell];

Answer 5

SWIFT 2 UPDATE

Here's how to find out which button was tapped

 @IBAction func yourButton(sender: AnyObject) {


 var position: CGPoint = sender.convertPoint(CGPointZero, toView: self.tableView)
    let indexPath = self.tableView.indexPathForRowAtPoint(position)
    let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath!)! as
    UITableViewCell
    print(indexPath?.row)
    print("Tap tap tap tap")

}

Answer 6

Crawling up view hierarchies with .superview (like all of the existing answers demonstrate) is a really bad way to do things. If UITableViewCell's structure changes (which has happened before) your app will break. Seeing .superview.superview in your code should set off alarm bells.

The button and its handler should be added to a custom UITableViewCell subclass and layed out there. That's where it belongs.

The cell subclass can then delegate out the button event through a standard delegate interface, or a block. You should aim for something like this:

- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    MyCustomCell *cell = ...;

    // ...

    cell.onButtonTapped = ^{
        [self buttonSelectedAtIndexPath:indexPath];
    }

    // OR

    cell.delegate = self;

    // ...
}

(Note: if you go the block route, you will need to use a __weak self reference to prevent retain cycles, but I thought that would clutter up the example).

If you take the delegate route you would then have this delegate method to implement:

- (void)cellButtonPressed:(UITableViewCell *)cell
{
    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
    // ...
}

Your code now has full access to the appropriate context when it handles the event.

Implementing this interface on your cell class should be straightforward.