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Changing the screen height of an iOS8 table when rotating a device in Swift

I am trying to use the new auto size for my tableview. Im doing this:

    tableView.rowHeight = UITableViewAutomaticDimension

I have a multi-line uilabel in my UITableViewCell with some restrictions that work great; row height is dynamic when I enter the table view in both landscape and portrait! Fine!

... but when I rotate the device, the rows get the base height (i.e. 44).

I added this line:

override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) 
{
    self.tableView.reloadData()
}

And the problem disappears. But is it really necessary? Should there be a better way to fix this?

Edit:

I just found out that the same problem occurs when I delete a row as a table as follows:

tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)

Am I missing something? Why does it work out of the box?

Change again:

Now I do like this:

self.tableView.estimatedRowHeight = 44
tableView.rowHeight = UITableViewAutomaticDimension

, API:

self.tableView.reloadData()
self.tableView.beginUpdates()
self.tableView.endUpdates()

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   self.tableView.reloadData()
}

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