UITextField subview of UITableViewCell, get indexPath of cell

Question

I have added a UITextField as a subview of a UITableViewCell. Then I have added a target and selector so that I can know when UIControlEventEditingChanged. This works great, but I would like you know the indexPath of the cell that the UITextField is in, as it could be added to any number of cells.

Is this possible? Basically I want to find the parent view which is a UITableViewCell.

Answer 1

Call [UIView superview] on the field to get the cell that it's in, then call [UITableView indexPathForCell:] on the cell to get the index path.

UPDATE: on iOS 7 you need to call superview on that view too (extra layer of views); here's a category on UITableView that should work independent of iOS version:

@interface UITableView (MyCoolExtension) 

- (NSIndexPath *)indexPathForCellContainingView:(UIView *)view;

@end

@implementation UITableView (MyCoolExtension)

- (NSIndexPath *)indexPathForCellContainingView:(UIView *)view {
    while (view != nil) {
        if ([view isKindOfClass:[UITableViewCell class]]) {
            return [self indexPathForCell:(UITableViewCell *)view];
        } else {
            view = [view superview];
        }
    }

    return nil;
}

@end

Answer 2

Instead of recursively trying to find the superview, there's a simpler solution:

Swift

func indexPathForCellContainingView(view: UIView, inTableView tableView:UITableView) -> NSIndexPath? {
    let viewCenterRelativeToTableview = tableView.convertPoint(CGPointMake(CGRectGetMidX(view.bounds), CGRectGetMidY(view.bounds)), fromView:view)
    return tableView.indexPathForRowAtPoint(viewCenterRelativeToTableview)
}

Objective-C

- (NSIndexPath *)indexPathForCellContainingView:(UIView *)view inTableView:(UITableView *)tableView {
    CGPoint viewCenterRelativeToTableview = [tableView convertPoint:CGPointMake(CGRectGetMidX(view.bounds), CGRectGetMidY(view.bounds)) fromView:view];
    NSIndexPath *cellIndexPath = [tableView indexPathForRowAtPoint:viewCenterRelativeToTableview];
    return cellIndexPath
}

I made this into a Gist for the Swift hearted