Label automatically hide/show on scrolling in Header View - swift

Question

I am using expandable tableView, which is show/hide on click sectionHeader.
As I want to add Label/Button on HeaderView. but at the time of scrolling the label show/hide automatically. but I doesn't want label is disappear on scroll of tableView.
My Code is -
func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
// Background view is at index 0, content view at index 1
if let bgView = view.subviews[0] as? UIView
{
if section == 0 {
let labelValue = UILabel(frame: CGRect(x: 5, y: 80, width: 40, height: 20))
labelValue.backgroundColor = UIColor.greenColor()
bgView.addSubview(labelValue)
}
if section == 1{
let labelValue = UILabel(frame: CGRect(x: 5, y: 80, width: 40, height: 20))
labelValue.backgroundColor = UIColor.redColor()
bgView.addSubview(labelValue)
}
if section == 2{
let labelValue = UILabel(frame: CGRect(x: 5, y: 80, width: 40, height: 20))
labelValue.backgroundColor = UIColor.yellowColor()
bgView.addSubview(labelValue)
}
if section == 3{
let labelValue = UILabel(frame: CGRect(x: 5, y: 80, width: 40, height: 20))
labelValue.backgroundColor = UIColor.blueColor()
bgView.addSubview(labelValue)
}
}
view.layer.borderColor = UIColor.blackColor().CGColor
view.layer.borderWidth = 0.3
}
ViewForHeaderSection
func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerView = HeaderView(tableView: self.customTableView, section: section)
headerView.backgroundColor = UIColor.whiteColor()
let label = UILabel(frame: headerView.frame)
label.textAlignment = NSTextAlignment.Center
label.font = UIFont (name: "HelveticaNeue-Light", size: 16)
label.textColor = UIColor.blackColor()
let labelValue = UILabel(frame: CGRect(x: 14, y: 15, width: 43, height: 32))
labelValue.textAlignment = NSTextAlignment.Center
labelValue.textColor = UIColor.whiteColor()
labelValue.font = UIFont(name: "HelveticaNeue-Bold", size: 13)
labelValue.text = "14"
//let btnExpand = UIButton(frame: headerView.frame)
let btnExpand = UIButton(frame:CGRect(x: 320, y: 17, width: 24, height: 24))
btnExpand.setBackgroundImage(UIImage(named: "expand"), forState: .Normal)
btnExpand.addTarget(self, action: #selector(HomeViewController.expandTableView), forControlEvents: .TouchUpInside)
if section == 0 {
label.text = "Runing Vehicle"
labelValue.backgroundColor = UIColor(red: 14/255.0, green: 76/255.0, blue: 12/255.0, alpha: 1.0)
btnExpand.addTarget(self, action: #selector(HomeViewController.expandTableView), forControlEvents: .TouchUpInside)
}
if section == 1 {
label.text = "Idle Vehicle"
labelValue.backgroundColor = UIColor(red: 148/255.0, green: 0/255.0, blue: 11/255.0, alpha: 1.0)
}
if section == 2 {
label.text = "Vehicle AT POI"
labelValue.backgroundColor = UIColor(red: 162/255.0, green: 136/255.0, blue: 5/255.0, alpha: 1.0)
}
if section == 3 {
label.text = "All Vehicle"
labelValue.backgroundColor = UIColor(red: 31/255.0, green: 61/255.0, blue: 127/255.0, alpha: 1.0)
}
headerView.addSubview(label)
headerView.addSubview(labelValue)
headerView.addSubview(btnExpand)
return headerView
}
func expandTableView(){
print("Hello")
customTableView.contentSize = CGSizeMake(375, 667)
}

Answer 1

You need to add that small label with that background color inside viewForHeaderInSection method because with willDisplayHeaderView it will add that label multiple time, so change your viewForHeaderInSection and remove the willDisplayHeaderView method.
func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerView = HeaderView(tableView: self.customTableView, section: section)
headerView.backgroundColor = UIColor.whiteColor()
let label = UILabel(frame: headerView.frame)
label.textAlignment = NSTextAlignment.Center
label.font = UIFont (name: "HelveticaNeue-Light", size: 16)
label.textColor = UIColor.blackColor()
let labelValue = UILabel(frame: CGRect(x: 0, y: 0, width: 50, height: headerView.frame.size.height))
if section == 0 {
label.text = "Runing Vehicle"
labelValue.backgroundColor = UIColor.greenColor()
}
if section == 1 {
label.text = "Idle Vehicle"
labelValue.backgroundColor = UIColor.redColor()
}
if section == 2 {
label.text = "Vehicle AT POI"
labelValue.backgroundColor = UIColor.yellowColor()
}
if section == 3 {
label.text = "All Vehicle"
labelValue.backgroundColor = UIColor.blueColor()
}
headerView.addSubview(label)
headerView.addSubview(labelValue)
return headerView
}
Edit: Change your last line of code that return the headerView like this
headerView.addSubview(label)
headerView.addSubview(labelValue)
headerView.addSubview(btnExpand)
headerView.sendSubviewToBack(label)
headerView.bringSubviewToFront(btnExpand)
return headerView