Expandable cell with dynamic data (swift) - swift

Question

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("idcell", forIndexPath: indexPath) as UITableViewCell
let lblTitle : UILabel = cell.contentView.viewWithTag(101) as! UILabel
lblTitle.text = (deptId[indexPath.row] as? String)! + " " + (deptDesc[indexPath.row] as? String)!
var height:CGFloat = 0
cell.backgroundColor = UIColor.whiteColor()
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
if(indexPath == selectedIndexPath){
cell.backgroundColor = UIColor.grayColor()
for i in 0...deptProfile.count-1{
let deptmentProfile = UIButton(frame: CGRectMake(0,44+height,400,41))
deptmentProfile.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
height = height+41
deptmentProfile.setTitle(deptProfile[i] as! String, forState: UIControlState.Normal)
deptmentProfile.setTitleColor(UIColor.blackColor(), forState: .Normal)
deptmentProfile.contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left
deptmentProfile.backgroundColor = UIColor.whiteColor()
deptmentProfile.titleEdgeInsets = UIEdgeInsetsMake(0, 40, 0, 0); //margin to the left
cell.addSubview(deptmentProfile)
}
cell.accessoryType = UITableViewCellAccessoryType.None
}
return cell
}
Question: since my expanded data is dynamic,(In coding)deptProfrile is dynamic. How can i clear the cell content? it seems the subview will remain to the cell every time.

Answer 1

You should notice that the cell is reused, so, you have not coded for the else case for that if: if(indexPath == selectedIndexPath). You should provide the code for UI for that else.
You can give the estimated cell height for the tableview, so it will expand the cell for you.
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
if(indexPath == selectedIndexPath){
var cellHeight = 100 // Assume this is the height when deptProfile.count = 0
cellHeight = cellHeight + 44 * deptProfile.count
return cellHeight
}
return super.tableView(tableView, heightForRowAtIndexPath: indexPath)
}