How do you get the indexPath of the cell you are tapping? - ios

Question

I am trying to execute an IBAction when a long-press is performed on a cell in a UITableView. The action involves the content of the cell so I need to get the indexPath in order to retrieve the content from a dictionary in local storage. The IBAction method is defined in the MasterViewController.m file which contains the UITableView methods and is subclassed from UITableViewController. I have tried all of the following, and they all return null instead of the indexPath for the cell.
UITableViewCell *cell = (UITableViewCell *)self;
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
I have also seen a few years-old answers to similar questions that use the position of the cell in the view, but I can't get any of those to work either.
UPDATE:
The IBAction, sendToPB, is being defined in a subclass of UITableViewController. There is a long-press gesture recognizer added to the cell in Interface Builder, with Sent Actions connected to sendToPB. The action is supposed to be copying the content of the cell to the clipboard when you long-press on the cell in the table view. All the ways I have tried so far return null for indexPath.
- (IBAction)sendToPB:(id)sender {
NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
NSString *object = self.objects[indexPath.row];
UIPasteboard *pb = [UIPasteboard generalPasteboard];
NSString *pressedCellText = [[Data getAllNotes] objectForKey:object];
[pb setString: pressedCellText];
}
UPDATE:
I have found two problems with this approach. First, the long-press gesture doesn't actually select the row, which is why all of the options that used indexPathForSelectedRow don't work. Second, sender is the gesture recognizer, and not the cell or row, so using sender also produces a null value for indexPath. With these two factors in mind, how else can you detect which cell you performed the long-press on?

Answer 1

You can get indexPath Like This on longPressGesture!
-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
CGPoint p = [gestureRecognizer locationInView:self.myTableView];
NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:p];
if (indexPath == nil) {
NSLog(#"long press on table view but not on a row");
}
else if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
{
NSLog(#"long press on table view at row %d", indexPath.row);
}
else
{
NSLog(#"gestureRecognizer.state = %d", gestureRecognizer.state);
}
}
may Be this Link will help you a little more

Answer 2

Declare variable 1st in .h file as
NSIndexPath *hitIndex;
then on long press method u can get the position of cell & hence indexpath
(void)longPressMethod:(UIButton *)btn
{
CGPoint hitPoint = [btn convertPoint:CGPointZero toView:tbl_traits];
hitIndex = [tbl_traits indexPathForRowAtPoint:hitPoint];
}

Answer 3

You can do it using Gesture Recognizers. Hope these snippets help.......
In your .h file
#interface yourClass ()
{
UILongPressGestureRecognizer *longPressRecognizer;
}
In viewDidLoad,
longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPressDetected:)];
longPressRecognizer.minimumPressDuration = 2;
longPressRecognizer.numberOfTouchesRequired = 1;
longPressRecognizer.delegate = self;
In cellForRowAtIndexPath, just before return statement
[cell addGestureRecognizer:longPressRecognizer];
And at the end,
- (void) longPressDetected:(UILongPressGestureRecognizer *)recognizer
{
UITableViewCell *selectedCell = (UITableViewCell *)recognizer.view;
// Your required code here
}

Answer 4

Edit: Thanks to #RegularExpression
First be sure to set the delegate of your tableView
self.myTableView.delegate = self
I believe this is what you are looking for:
Swift
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//save the indexPath.row as an integer inside a property or pass it to your action
}
You can then save the index of from the above method or simple call your action passing that index inside the above method.
Objective-C
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//save the indexPath.row as an integer inside a property or pass it to your action
}

Answer 5

If this is inside a UITableViewController subclass, then casting self (which is an instance of the UITableViewController subclass) to UITableViewCell will not return the cell selected.
There is really 2 ways of doing this:
1- The easy way: Don't use an IBAction and just implement the delegate methods:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
2- The relatively easy way: in your IBaction, you can get the selected cell by using the property:
self.tableview.indexPathForSelectedRow
This property will give you the indexpath of the selected cell.

Answer 6

If you attached the UILongPressGestureRecognizer to the cell by calling cell.addGestureRegognizer(_: _: _:) you should retrieve the cell from the sender by doing
let touchedView = sender.view as! UITableViewCell
Anyway, the best way to achieve this usually is by inspecting the dataSource instead of calling the UITableViewDataSource methods

Answer 7

You could subclass UITableViewCell and add an IVar for the index path and set that when cellForRowAtIndexPath is called for the UITableView dataSource protocol.