CODEWITHSUNDEEP
iosobjective-cuitableviewios7
Ludwig Meier
Ludwig Meier

Reputation: 277

indexPathForCell returns nil since ios7

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?

Upvotes: 19

Views: 11381

Answers (3)

Steve
Steve

Reputation: 11

Experiencing this problem in iOS 11, but not in 9 or 10, I overrode the func indexPath(for cell: UITableViewCell) -> IndexPath? method using the technique that @drexel-sharp detailed previously:

override func indexPath(for cell: UITableViewCell) -> IndexPath? {
    var indexPath = super.indexPath(for: cell)
    if indexPath == nil { // TODO: iOS 11 Bug?
        let point = cell.convert(CGPoint.zero, to: self)
        indexPath = indexPathForRow(at: point)
    }
    return indexPath
}

Upvotes: 0

Martin R
Martin R

Reputation: 540075

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.

Upvotes: 30

drexel sharp
drexel sharp

Reputation: 323

I was finding cells the same way you were. Now I use this quick method if I have a button in a cell and know the tableview I'm in. It'll return the tableviewcell. 

-(UITableViewCell*)GetCellFromTableView:(UITableView*)tableView Sender:(id)sender {
    CGPoint pos = [sender convertPoint:CGPointZero toView:tableView];
    NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:pos];
    return [tableView cellForRowAtIndexPath:indexPath];
}

Upvotes: 22

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