detecting uibutton pressed in tableview: Swift Best Practices

If your code allows, I'd recommend you set the UIButton tag equal to the indexPath.row, so when its action is triggered, you can pull the tag and thus row out of the button data during the triggered method. For example, in cellForRowAtIndexPath you can set the tag:

button.tag = indexPath.row
button.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)

then in buttonClicked:, you can fetch the tag and thus the row:

func buttonClicked(sender:UIButton) {

    let buttonRow = sender.tag
}

Otherwise, if that isn't conducive to your code for some reason, the Swift translation of this Objective-C answer you linked to:

- (void)checkButtonTapped:(id)sender
{
    CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.tableView];
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];
    if (indexPath != nil)
    {
     ...
    }
}

is:

func checkButtonTapped(sender:AnyObject) {
      let buttonPosition = sender.convert(CGPoint.zero, to: self.tableView)
    let indexPath = self.tableView.indexPathForRow(at: buttonPosition)
    if indexPath != nil {
        ...
    }
}

Swift 3.0 Solution

cell.btnRequest.tag = indexPath.row

    cell.btnRequest.addTarget(self,action:#selector(buttonClicked(sender:)), for: .touchUpInside)

    func buttonClicked(sender:UIButton) {

            let buttonRow = sender.tag
        }