Scroll to bottom for Table View after Reload Data

Question

I am trying to scroll my table view to bottom after adding comments and replies. Comments are sections and replies are rows for that particular section but table view doesn't scroll at the exact bottom of the content after API call for adding comment, I have tried every possible solution available on net. Kindly suggest any solution for the same

Could you share some code for better explanation? What have you tried before? — emrcftci, Mar 05 '20 at 12:06

score 1 · Answer 1 · answered Mar 05 '20 at 12:11

1

This can be done with simple TableView scroll to bottom using IndexPath

tblView.scrollToRow(at: IndexPath(row: 8, section: 0), at: .bottom, animated: true)

answered Mar 05 '20 at 12:11

RJ168

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Unfortunately there are no rows for the last section – User Tech Mar 05 '20 at 13:55
So are you showing comments? – RJ168 Mar 05 '20 at 13:57
I am showing comments which are sections of UITableView – User Tech Mar 05 '20 at 14:00
What do you have in section? Header? – RJ168 Mar 05 '20 at 14:02
Yes UITableViewHeaderFooterView whose height is dynamic – User Tech Mar 05 '20 at 14:03

steveSarsawa · Answer 2 · 2020-03-05T12:11:29.537

0

From Jayraj Vala answer

You've calculate the contentSize of the tableView to scroll at any particular point Use below code to scroll to bottom of tableView.

func scrollToBottom()  {
        let point = CGPoint(x: 0, y: self.tableView.contentSize.height + self.tableView.contentInset.bottom - self.tableView.frame.height)
        if point.y >= 0{
            self.tableView.setContentOffset(point, animated: animate)
        }
  }

Use described func() when you want to scroll tableView.

edited Mar 05 '20 at 12:11

answered Mar 05 '20 at 12:09

steveSarsawa

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May I also add that you should call this **after** you call your `reloadData()` function as otherwise it will have the incorrect `contentSize` calculations – Chackle Mar 05 '20 at 12:11
Thanks very much for the help, but I have tried above code which doesn't solve my issue – User Tech Mar 05 '20 at 13:59

Chackle · Answer 3 · 2020-03-05T12:21:41.563

0

As an extension for UITableView:

extension UITableView {

    func scrollToBottom(withAnimation animated: Bool = true)  {
        let rowCount = self.numberOfRows(inSection: self.numberOfSections - 1) - 1
        // This ensures we don't scroll to the bottom if there is no content
        guard rowCount > 0 else { return }

        let point = CGPoint(x: 0, y: self.contentSize.height + self.contentInset.bottom - self.bounds.height)
        // This ensures we don't scroll to the bottom if all the content is small enough to be displayed without a scroll
        guard point.y >= 0 else { return }

        self.setContentOffset(point, animated: animated)
    }
}

Be sure to call this after tableView.reloadData() otherwise the table view contentSize used will be incorrect.

edited Mar 05 '20 at 12:21

answered Mar 05 '20 at 12:14

Chackle

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Unfortunately there are no rows for the last section. I want to navigate to last section – User Tech Mar 05 '20 at 13:56
@UserTech Just remove the `rowCount` check then. The point and scrolling code will work – Chackle Mar 05 '20 at 14:08
Yes I have tried the code `let point = CGPoint(x: 0, y: self.contentSize.height + self.contentInset.bottom - self.bounds.height) // This ensures we don't scroll to the bottom if all the content is small enough to be displayed without a scroll guard point.y >= 0 else { return } self.setContentOffset(point, animated: animated)` but unfortunately it doesn't work for me – User Tech Mar 05 '20 at 14:17
@UserTech instead of `self.setContentOffset(point, animated: animated)` can you try `self.contentOffset = point`?. Also try calling `self.layoutIfNeeded()` after too if it still doesn't work. – Chackle Mar 05 '20 at 14:19

Scroll to bottom for Table View after Reload Data

3 Answers3