Start UITableView scrolled to bottom

Question

How do I start a UITableView scrolled to the last cell?

not animated
not after view appeared
not after table view is even added as a subview

just have a plain UITableView(frame: CGRectZero, style: UITableViewStyle.Plain) that when presented on screen, will start scrolled all the way to the bottom.

I've tried:

// 1
reloadData()
scrollToRowAtIndexPath(
    NSIndexPath(forItem: dataArray.count-1, inSection: 0),
    atScrollPosition: .Top, animated: false
)

// 2
reloadData()
var contentOffset = self.contentOffset
contentOffset.y = CGFloat.max
setContentOffset(contentOffset, animated: false)

on the tableView's init method (in my subclass)

I've also tried the classic CGAffineTransformMakeScale(1,-1) hack, but that makes my cells stick to the bottom and I want them stuck the the top (but scrolled to the bottom). (that is only relevant if I have few cells, when they don't fill the entire UITableView space)

EDIT: another detail, I'm using dynamic cells UITableViewAutomaticDimension.

Refer to https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScrollView_Class/index.html#//apple_ref/occ/instm/UIScrollView/setContentOffset:animated: I think that is what you are looking for. Just set animated to false. — Kendel, Aug 28 '16 at 22:48
For the 1st one, try setting the atScrollPosition to .Bottom. — Pranav Wadhwa, Aug 28 '16 at 23:12
just call `tableView.setContentOffset(CGPointMake(0, CGFloat.max), animated: false)` in `viewDidLoad`. — Ozgur Vatansever, Aug 29 '16 at 00:46
@Kendel that's my second attempt. @penatheboss tried =/. @ozgur I don't have a `viewDidLoad` here, I'm using just a `UITableView` that will be added to another view that is already loaded (but just to discard the possibility, I also had that same code using a regular `UITableViewController` and still get the same problem). — Rodrigo Ruiz, Aug 29 '16 at 00:52

score 8 · Answer 1 · edited Oct 11 '18 at 12:12

8

This will scroll to bottom without any glitch, but if you use Tableview scroll-to-row property then there will be glitch.

For Swift 3 use

self.TableView.reloadData() // To populate your tableview first
//Since we have to wait until the table is reload
 DispatchQueue.main.async {
 let bottomOffset = CGPoint(x: 0, y: self.TableView.contentSize.height - self.TableView.frame.size.height)
 self.TableView.setContentOffset(bottomOffset, animated: false)
 }

For Objective C use

[YourTableView reloadData]; // To populate your tableview first

[YourTableView setContentOffset:CGPointMake(0, YourTableView.contentSize.height - YourTableView.frame.size.height)];

edited Oct 11 '18 at 12:12

guru

2,727
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39

answered Aug 29 '16 at 05:39

Irfan Anwar

1,878
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30

maybe for swift : -- : [YourTableView setContentOffset:CGPointMake(0, YourTableView.contentSize.height - YourTableView.frame.size.height) animated:NO]; – Irfan Anwar Aug 29 '16 at 05:41
1

the above code is not scrolls exact at bottom, it is near 150 px up from the bottom.did you have any idea? – guru Oct 08 '18 at 15:32
1

@guru : it will scroll exactly to bottom, what u need to check is that your data is loaded completely before `self.TableView.setContentOffset()` function. Follow this link for help: https://stackoverflow.com/questions/16071503/how-to-tell-when-uitableview-has-completed-reloaddata – Irfan Anwar Oct 10 '18 at 08:52
Welcome @guru :) also plz Vote Up if u think answer is right so it can also help other developers. Thanks – Irfan Anwar Oct 10 '18 at 11:20

aatalyk · Answer 2 · 2016-08-29T06:42:11.790

EDIT:

animated: false

func scrollBottom() {
    let lastIndex = NSIndexPath(forRow: dataArray.count-1, inSection: 0)
    self.tableView.scrollToRowAtIndexPath(lastIndex, atScrollPosition: UITableViewScrollPosition.Bottom, animated: false)
}

TEST CODE:

import UIKit

class TableViewController: UITableViewController {

var goButton = UIButton()

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.delegate = self
    tableView.dataSource = self

    goButton = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
    goButton.backgroundColor = UIColor.blueColor()
    goButton.addTarget(self, action: #selector(TableViewController.scrollBottom), forControlEvents: .TouchUpInside)
    self.view.addSubview(goButton)
}



override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return 500
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell

    cell.textLabel?.text = "Hello, World!"

    return cell
}

func scrollBottom() {
    let lastIndex = NSIndexPath(forRow: 499, inSection: 0)
    self.tableView.scrollToRowAtIndexPath(lastIndex, atScrollPosition: UITableViewScrollPosition.Bottom, animated: false)
}

}

now use dynamic cells and I want the scroll before showing the view, you're doing it after the user is already seeing everything — Rodrigo Ruiz, Aug 29 '16 at 07:10

score 0 · Answer 3 · answered Feb 23 '22 at 01:12

You can either set the content offset:

tableview.contentOffset = CGPoint(x: ??, y: ??)

Or scroll to the desired row

tableview.contentOffset.scrollToItem(at: IndexPath(row: tableview.contentOffset.numberOfItems(inSection: 0) - 1, section: 0), at: .bottom, animated: false)

To get this to happen before the view appears so that the user doesn't see the transition, simply call these methods in the viewDidLayoutSubviews() lifecycle method of your view controller.

Start UITableView scrolled to bottom

3 Answers3