Swift ios 9: Section header change position after reload data

Question

I have plain UITableView with many sections and rows. Sections work fine. But sometimes after reload data of table, section change position. For example it was happened when

Answer 1

tableView.reloadData()
tableView.layoutIfNeeded()
tableView.beginUpdates()
tableView.endUpdates()

This help me out.

Double reloadData will cause flickering while this solution won't.