How to change the Title label text alignment of the section when it was present - ios

Question

I'm loading the UITableView with two section and I've used viewForHeaderInSection method to set the title for each section. Initially I've set the title label text alignment as .left. Now when I scroll the table view and the second section was present i want to change the title label text alignment to .center. And when I scroll down the table view i want to show as initial(like second section text alignment as .left). How can I Do that?
Here is the TableView Delegatemethod I've used to load the section.
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerLabel:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.width, height: 20))
headerLabel.textColor = UIColor.white
headerLabel.textAlignment = .left
headerLabel.font = Fonts.kFontWith_14
if section == 0
{
headerLabel.text = NSLocalizedString("Suggested", comment: "")
headerLabel.backgroundColor = Colors.kAppBgColor
headerLabel.textAlignment = .left
}
else{
headerLabel.text = NSLocalizedString("Contacts", comment: "")
headerLabel.backgroundColor = Colors.kLightBlueColor
headerLabel.textAlignment = .left
}
headerLabel.sizeToFit()
return headerLabel
}

Answer 1

Take one bool variable on global, The follwoing delegate will respond you when scroll happens
var isDirection = Bool()
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if velocity.y > 0 {
print("up")
isDirection = true
}
if velocity.y < 0 {
print("down")
isDirection = false
}
}
Then write a condition in respective `tableview` delegate
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerLabel:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.width, height: 20))
headerLabel.textColor = UIColor.white
headerLabel.textAlignment = .left
headerLabel.font = Fonts.kFontWith_14
if section == 0
{
headerLabel.text = NSLocalizedString("Suggested", comment: "")
headerLabel.backgroundColor = Colors.kAppBgColor
}
else{
headerLabel.text = NSLocalizedString("Contacts", comment: "")
headerLabel.backgroundColor = Colors.kLightBlueColor
}
if isDirection{
headerLabel.textAlignment = .left
}else{
headerLabel.textAlignment = .center
}
return headerLabel
}
Remove
headerLabel.sizeToFit()
This is sample, you enable bool variable based on your scroll direction. If delegate does not call, reload your table on scrollViewWillEndDragging

Answer 2

Here is the way for my problem
Take a bool value and a CGPoint globally and assign the UITableView.ContentOffset value to the defaultOffset in viewDidload Method.
var isScroll:Bool = Bool()
var defaultOffSet = CGPoint()
override func viewDidLoad() {
super.viewDidLoad()
defaultOffSet = tableView.contentOffset
}
And I've used this scrollView delegate method
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if contactsTableView.rectForHeader(inSection: 1).origin.y > contactsTableView.contentOffset.y-defaultOffSet.y {
isScrolled = false
}
else if tableView.rectForHeader(inSection: 0).origin.y <= tableView.contentOffset.y-defaultOffSet.y{
isScrolled = true
}
tableView.reloadData()
}
And In my tableview viewForHeaderInSection
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerLabel:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.width, height: 20))
headerLabel.textColor = UIColor.white
headerLabel.textAlignment = .left
headerLabel.font = Fonts.kFontWith_14
if section == 0
{
headerLabel.text = NSLocalizedString("Suggested", comment: "")
headerLabel.backgroundColor = Colors.kAppBgColor
headerLabel.textAlignment = .left
}
else{
headerLabel.text = NSLocalizedString("Contacts", comment: "")
headerLabel.backgroundColor = Colors.kLightBlueColor
if isScrolled{
headerLabel.textAlignment = .center
headerLabel.backgroundColor = Colors.kAppBgColor
}
}
}
}