Reload header in section without reloading section rows in swift

I'm trying to reload UITableView section Header instead of reloading the whole section's rows because I have a UITextfield in the row and when I call tableview reloadSections it's clear the textfield value.

let sectionIndex = IndexSet(integer: 0)
self.tableView.reloadSections(sectionIndex, with: .none)

You can reload the tableview with this code. You dont need to reload header for showing items