Error: UITableView jump to top with UITableViewAutomaticDimension

Question

I am using UITableView with estimatedRowHeight and UITableViewAutomaticDimension. Also I am using NSFetchedResultsControllerDele

Answer 1

  func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
    switch type {
    case .Insert:

      tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .None)
        break

    case .Update:
        tableView.reloadRowsAtIndexPaths([indexPath!], withRowAnimation: .None)
        break

    case .Delete:
        tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .None)
        break

    default: break;
    }
   tableView.reloadData()
  let indexPath = NSIndexPath(forRow: 0, inSection: 0)
  self. tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: .Top, animated: true)
   }

}

Answer 2

To solve my problem I save the cell height in the willDisplay method and in estimatedHeightForRowAt I'm retrieving the value.

var cellHeights = NSMutableDictionary()

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}

override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
    if let height = cellHeights.object(forKey: indexPath) {
        return height as! CGFloat
    }

    return UITableViewAutomaticDimension
}

override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    cellHeights.setObject(cell.frame.size.height, forKey: indexPath as NSCopying)
}

Answer 3

tableView.reloadData()
if tableView.numberOfRowsInSection(0) > 0
{
      let indexPath = NSIndexPath(forRow: 0, inSection: 0)
      self. tableView.scrollToRowAtIndexPath(indexPath, atScrollPosition: .Top, animated: true)
}

Answer 4

let cou : Int = self.Array.count as Int
let lastindex : NSIndexPath = NSIndexPath(forRow: cou-1, inSection: 0)
self.TableName.scrollToRowAtIndexPath(lastindex, atScrollPosition: UITableViewScrollPosition.None, animated: true)

This code help you to scroll your tableview at particular position.

Answer 5

func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    tabelView.reloadData()
}

this is work for me

Answer 6

Adding to @jayesh-miruliya 's answer, in your NSFetchedResultsControllerDelegate after the switch statement, put this in your code:

tableView.reloadData()
dispatch_async(dispatch_get_main_queue(), {
    let topCellIndexPath = NSIndexPath(forRow: 0, inSection: 0)
    self. tableView.scrollToRowAtIndexPath(topCellIndexPath, atScrollPosition: .Top, animated: true)
})