cell.selected doesn't work - ios

Question

When I selected a row, text color turns white. however, when I scroll to refresh the row, the text color turns back to black. so I have added a logic if(cell.selected). However it didn't work. when I scroll. the code can't get into if case.Here is the code :-
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let selectedCell:UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
for subview in selectedCell.subviews {
if let view = subview as? UILabel {
view.textColor = UIColor.whiteColor()
}
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var renderWidth:CGFloat = 8
var renderYPosition:CGFloat = 15
let cell:UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "idcell")
let date = UILabel(frame: CGRectMake(renderWidth, renderYPosition, 110, 20))
let dateText = "asdasdsad"
date.text = dateText
if (cell.selected) {
date.textColor = UIColor.whiteColor()
}
cell.addSubview(date)
}

Answer 1

You are creating a new UITableViewCell everytime. It is recommended to reuse it.
Instead of creating a new cell with this:
let cell:UITableViewCell=UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "idcell")
Use this to reuse the cell:
let cell = tableView.dequeueReusableCellWithIdentifier("cellIdInStoryboard", forIndexPath: indexPath) as! UITableViewCell
The identifier should be the same as the one you set in storyboard.

Answer 2

The problem is with your if clause in cellForRowAtIndexPath function and also you create cell instance everytime you load the tableview.You need to reuse tableview cells.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var renderWidth:CGFloat = 8
var renderYPosition:CGFloat = 15
let cell = tableView.dequeueReusableCellWithIdentifier("idcell", forIndexPath: indexPath) as! YourTableViewCell
let date = UILabel(frame: CGRectMake(renderWidth, renderYPosition, 110, 20))
let dateText = "asdasdsad"
date.text = dateText
if (cell.selected) {
date.textColor = UIColor.whiteColor()
} else {
date.textColor = UIColor.blackColor() // You didn't add else
}
cell.addSubview(date)
}