CODEWITHSUNDEEP
iphoneiosuitableview
CodeGuy
CodeGuy

Reputation: 28905

Getting the exact location of a UITableViewCell

Given a UITableView, how can I find the location of a specific UITableViewCell? In other words, I want to get its frame relative to my iPhone screen, not relative to the UITableView. So if my UITableView is scrolled up, the location of each UITableViewCell should be higher on the screen, etc.

Upvotes: 55

Views: 60037

Answers (9)

William Hu
William Hu

Reputation: 16159

Swift 3

Relative to the tableView:

let rect = self.tableView.rectForRow(at: indexPath)

Relative to the Screen:

If you only know the cell,

if let indexPath = tableView.indexPath(for: cell) {
     let rect = self.tableView.rectForRow(at: indexPath)
     let rectInScreen = self.tableView.convert(rect, to: tableView.superview)
}

If you know the indexPath then don't need call the if statement.

Upvotes: 17

T. Benjamin Larsen
T. Benjamin Larsen

Reputation: 6393

Swift-version of Tomasz and Jhaliya's answers in case anyone (else) struggles with this:

var cellRect = tableView.rectForRow(at: indexPath)
cellRect = cellRect.offsetBy(dx: -tableView.contentOffset.x, dy: -tableView.contentOffset.y)

Upvotes: 1

Milan Vadgama
Milan Vadgama

Reputation: 321

try it in

didSelectRowAtIndexPath method

UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


        // get current location of selected cell

        CGRect rectInTableView = [tableView rectForRowAtIndexPath:indexPath];

        CGRect rectInSuperview = [tableView convertRect:rectInTableView toView:[tableView superview]];


         NSLog(@"Cell Y Is %f",rectInSuperview.origin.y);

        NSLog(@"Cell X Is %f",rectInSuperview.origin.x);

Upvotes: 9

Rob Sanders
Rob Sanders

Reputation: 5347

For future viewers, I was having trouble getting a reliable frame for cells in a UITableView. I was trying to display a UIAlertController in ActionSheet style on an iPad which needs a popover presentation. In the end this approach yielded the best results:

// 44 is the standard height for a cell in a UITableView
// path is the index path of the relevant row
// controller is the UIAlertController
CGRect frame = CGRectZero;
frame.origin.y = 44 * path.row;
frame.origin.x = table.frame.origin.x;
frame.size = CGSizeMake(table.frame.size.width, 44);
controller.popoverPresentationController.sourceRect = [tableView convertRect:frame toView:self.view];
controller.popoverPresentationController.sourceView = self.view;

Upvotes: 1

Tomasz
Tomasz

Reputation: 3466

Apart from rectForRowAtIndexPath you need to consider the scrolling.

Try this code:

 // Get the cell rect and adjust it to consider scroll offset
 CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath];
 cellRect = CGRectOffset(cellRect, -tableView.contentOffset.x, -tableView.contentOffset.y);

Upvotes: 64

noRema
noRema

Reputation: 559

Jhaliya's answer wasn't quite enough for me, I needed to do some more manipulations to get it working. My tableView was added to a viewController and its location on the right half way down the screen. So you need to take the tableView origin into account aswel as the scroll offset.

CGRect rowRect = [tableView rectForRowAtIndexPath:indexPath];
CGPoint offsetPoint = [self.infoTableView contentOffset];

// remove the offset from the rowRect
rowRect.origin.y -= offsetPoint.y;

// Move to the actual position of the tableView
rowRect.origin.x += self.infoTableView.frame.origin.x;
rowRect.origin.y += self.infoTableView.frame.origin.y;

Upvotes: 5

Steve N
Steve N

Reputation: 2737

If you really need to convert specifically to a point in the window, you could do this:

[yourAppDelegate.window convertPoint:[cell.contentView.center] fromView:[cell.contentView]];

I used the cells center coordinate, but you could use any point you want.

Vladimir is right, watch out for rows that are not visible (or that have been recycled).

-S

Upvotes: 0

Jhaliya - Praveen Sharma
Jhaliya - Praveen Sharma

Reputation: 31722

You could also use the rectForRowAtIndexPath method to get the location of a UITableView by sending the indexPath for that.

- (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath

So use as below:

CGRect myRect = [tableView rectForRowAtIndexPath:indexPath];

Upvotes: 101

Vladimir
Vladimir

Reputation: 170849

Try the following(sending nil as a toView parameter means you want to convert you rect to window coordinates):

CGRect r = [cell convertRect:cell.frame toView:nil];

And remember that if particular row is not currently visible then there may not be UITableViewCell for it - so before using that code you may need to check if cell is valid (not nil for example)

Upvotes: 23

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