UITableView scroll to bottom from current position

问题

How can I scroll to last row in tableview from current positon, because I have tried this solution:

self.tableView.scrollToRow(at: lastIndex.last!, at: .bottom , animated: false)


let numberOfSections = self.tableView.numberOfSections
            let numberOfRows = self.tableView.numberOfRows(inSection: numberOfSections-1)

        if numberOfRows > 0 {
            let indexPath = IndexPath(row: numberOfRows-1, section: (numberOfSections-1))
            self.tableView.scrollToRow(at: indexPath, at: .bottom, animated: animated)
        }

and it doesn't scroll from the current position but from the most top position. Even though my current position is the last row

回答1:

Do

func scrollToLastRow() {
  let indexPath = NSIndexPath(forRow: objects.count - 1, inSection: 0)
  self.tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: .Bottom, animated: true)
}

Scrolling means, thats from current position. So this code should work.

Otherwise you can specify the frame to scroll using scrollRectToVisible

tableView.scrollRectToVisible(tableView.rectForRowAtIndexPath(indexPath),animated: true) 

回答2:

Try this code,

yourTableView.scrollRectToVisible(CGRect.init(x: 0, y: yourTableView.contentSize.height - yourTableView.frame.size.height, width: yourTableView.frame.size.width, height: yourTableView.frame.size.height), animated: true)

回答3:

You have to provide some more info that when you want to scroll your tableview to last index,Because this code works perfectly

let indexPath = IndexPath.init(row: lastRow, section: 0)
customTableView.scrollToRow(at: indexPath, at: .bottom, animated: true)

Updated

Finally here is working code for me

  @IBAction func sendBtnPressed(_ sender: UIButton) {
    self.listMessages.append(messageTextView.text)
    let lastIndexPath = IndexPath.init(row: self.listMessages.count-1, section: 0)
    self.tableView.insertRows(at: [lastIndexPath], with: .none)
    self.tableView.scrollToRow(at: lastIndexPath, at: .bottom, animated: true)
    messageTextView.text = "";
    }

回答4:

For swift 4

func scrollToLastRow() {

    if CommentNameArray.count != 0 {
        let indexPath = NSIndexPath(row: CommentNameArray.count - 1, section: 0)
        self.CommentTableView.scrollToRow(at: indexPath as IndexPath, at: .bottom, animated: true)
    }

}

来源：https://stackoverflow.com/questions/45205592/uitableview-scroll-to-bottom-from-current-position