CODEWITHSUNDEEP
iosobjective-cxcodeios6
James Douglas
James Douglas

Reputation: 736

How to get UITableViewCell's index from its UITextField?

I have a UITextField in a custom cell inside table. I created new class DataCell which is subclass of UITableViewCell. Inside DataCell I created outlets for textfields and I also have method inside implementation file which uses 'editing did end' and I manipulate textField values there.

I am now wondering how to get rowIndex or number of the cell, as each time I click + button new custom cell is loaded on the table. If I get tag I always get same tag number regardless of the cell I selected.

Upvotes: 4

Views: 4419

Answers (4)

nkongara
nkongara

Reputation: 1229

You can use this logic when you are not sure of hierarchy between textfield and cell.

UITableViewCell *cell = nil;
UIView *parentView = textField.superview;
while(parentView) {
    if([parentView isKindOfClass:[UITableViewCell class]]) {
         cell = parentView;
         break;
    }
    parentView = parentView.superview;
} 

if(cell)
 NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

Upvotes: 2

Tommy
Tommy

Reputation: 100632

If we're accepting fragile answers then for the sake of contributing something new to the conversation:

CGRect rectInTableView =
    [tableView convertRect:textField.bounds fromView:textField];

NSUInteger indexOfCellContainingTextField =
    (NSUInteger)(rectInTableView.y / tableView.rowHeight);

Assumptions that make it fragile: (i) all rows are the same height; (ii) the height is set on the table view. If you haven't implemented UITableViewDelegate -tableView:heightForRowAtIndexPath: then both of those assumptions will hold true. You're also taking advantage of the fact that casting a positive float to an integer rounds down.

I would argue that although still not completely clear of assumptions, this is less fragile than Mundi's solution because it makes assumptions only about things you do directly control (ie, cell sizing) and not about things you don't (ie, the view hierarchy UIKit uses internally to present table views).

Upvotes: 0

rdelmar
rdelmar

Reputation: 104082

Add tags to the text field in the tableView:cellForRowAtIndexPath: method. In this example, I have a custom cell with a label and a text field:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    RDCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    cell.label1.text = self.theData[indexPath.row];
    cell.textField.tag = indexPath.row;
    return cell;
}

It sounds like you are maybe handling the end of editing in your custom cell class, but you might want to consider doing it in the table view controller instead, since that gives you easy access to the model, which I presume you are modifying with what the user types in the text field. If you do that, then you should connect the text field's delegate property up to the table view controller in IB.

Upvotes: 1

Mundi
Mundi

Reputation: 80265

The text field passed to your delegate is a subview of the cell's contentView. 

UITableViewCell *cell = (UITableViewCell*) textField.superview.superview; 
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

Upvotes: 11

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