indexPathForCell returns nil since ios7

Question

my app was running fine under ios6.1. tried the ios7 simulator and the following part does not work:

EditingCell *cell = (EditingCell*) [[textField superview] superview];
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
NSLog(@"the section is %d and row is %d", indexPath.section, indexPath.row);
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *rowKey = [[keysForRows objectAtIndex: section] objectAtIndex: row];

It always comes:

the section is 0 and row is 0

although another section / row were selected. Has someone an idea why this does not work under ios7?

Answer 1

Your approach to find the "enclosing" table view cell of a text field is fragile, because is assumes a fixed view hierarchy (which seems to have changed between iOS 6 and iOS 7).

One possible solution would be to traverse up in the view hierarchy until the table view cell is found:

UIView *view = textField;
while (view != nil && ![view isKindOfClass:[UITableViewCell class]]) {
    view = [view superview];
}
EditingCell *cell = (EditingCell *)view;

A completely different, but often used method is to "tag" the text field with the row number:

cell.textField.tag = indexPath.row;   // in cellForRowAtIndexPath

and then just use that tag in the text field delegate methods.