CODEWITHSUNDEEP
iosiphoneuitableviewscrolldetect
Ward
Ward

Reputation: 3318

UITableView Detecting Last Cell

How can I detect when a UITableView has been scrolled to the bottom so that the last cell is visible?

Upvotes: 22

Views: 36534

Answers (8)

Shakeel Ahmed
Shakeel Ahmed

Reputation: 6013

Swift 5+

//Show Last Cell (for Table View)
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) 
{
    if indexPath.row == (yourdataArray.count - 1) 
    {
        print("came to last row")
    }
}

//Show last cell (for Collection View)
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) 
{
    if indexPath.row == (yourdataArray.count - 1)
    {
        // Last cell is visible
    }
}

Upvotes: 4

Luchi Parejo Alcazar
Luchi Parejo Alcazar

Reputation: 151

I found this solution:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
      let contentOffsetMaxY: Float = Float(scrollView.contentOffset.y + scrollView.bounds.size.height)
      let contentHeight: Float = Float(scrollView.contentSize.height)
      let lastCellIsVisible = contentOffsetMaxY > contentHeight + somePaddingIfWanted
      if lastCellIsVisible {
           doSomething()
      }
}

Upvotes: 1

J. Doe
J. Doe

Reputation: 13013

I had some problems with the willDisplayCell method. This works for me:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let y = scrollView.contentOffset.y/(scrollView.contentSize.height - scrollView.frame.size.height)
    let relativeHeight = 1 - (table.rowHeight / (scrollView.contentSize.height - scrollView.frame.size.height))
    if y >= relativeHeight{
        print("last cell is visible")
    }
}

Just pass this in the delegate methods, and change 'table' to your tableView.

Upvotes: 0

Bartłomiej Semańczyk
Bartłomiej Semańczyk

Reputation: 61774

Create elegant extension for UITableView:

extension UITableView {

    func isLast(for indexPath: IndexPath) -> Bool {

        let indexOfLastSection = numberOfSections > 0 ? numberOfSections - 1 : 0
        let indexOfLastRowInLastSection = numberOfRows(inSection: indexOfLastSection) - 1

        return indexPath.section == indexOfLastSection && indexPath.row == indexOfLastRowInLastSection
    }
}

Example of usage:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    if tableView.isLast(for: indexPath) {
        //do anything then
    }

    return cell
}

Upvotes: 8

shafi
shafi

Reputation: 456

For Xcode 8 and swift 3

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        let lastSectionIndex = tableView.numberOfSections - 1
        let lastRowIndex = tableView.numberOfRows(inSection: lastSectionIndex) - 1
        if indexPath.section ==  lastSectionIndex && indexPath.row == lastRowIndex {
            print("this is the last cell")
        }
    }

Upvotes: 3

samwize
samwize

Reputation: 27353

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    NSInteger lastSectionIndex = [tableView numberOfSections] - 1;
    NSInteger lastRowIndex = [tableView numberOfRowsInSection:lastSectionIndex] - 1;
    if ((indexPath.section == lastSectionIndex) && (indexPath.row == lastRowIndex)) {
        // This is the last cell
    }
}

Upvotes: 14

Michael Kessler
Michael Kessler

Reputation: 14235

Inside tableView:cellForRowAtIndexPath: or tableView:willDisplayCell:forRowAtIndexPath: like this:

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

    ...

    NSInteger sectionsAmount = [tableView numberOfSections];
    NSInteger rowsAmount = [tableView numberOfRowsInSection:[indexPath section]];
    if ([indexPath section] == sectionsAmount - 1 && [indexPath row] == rowsAmount - 1) {
        // This is the last cell in the table
    }

    ...

}

Upvotes: 41

Art Gillespie
Art Gillespie

Reputation: 8757

Implement the tableView:willDisplayCell:forRowAtIndexPath: method in your UITableViewDelegate and check to see if it's the last row.

Upvotes: 27

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