UITableView reload data flashes for a second - ios

Question

I am using pagination on UITableView, after the first load when the next items is about to come or as I reload the tableView it flashes for a second and then comes to it's last position. But it does not happen every time having a hard time solving this out. Anyone can help me please?
Here is the code I am using to reload the data in the tableView
func handleWSSuccessResponse(_ arrRestaurant:[Restaurant],filterBy:filteringByValues){
let offSet = self.IBtblUserFeed.contentOffset
print(arrRestaurant.count)
if (self.arrRestaurants.count > 0) {
if arrRestaurant.count > 0 && arrRestaurant.count <= 10 {
if arrRestaurant.count % 10 != 0 {
isDataLoading = false
actInd.stopAnimating()
}
if !(self.isFromRefresh) {
self.arrRestaurants = self.arrRestaurants + arrRestaurant
}
DispatchQueue.main.async {
if (self.isFromRefresh) {
self.IBtblUserFeed.reloadData()
} else {
UIView.setAnimationsEnabled(false)
self.IBtblUserFeed.reloadData()
UIView.setAnimationsEnabled(true)
self.IBtblUserFeed.layoutIfNeeded()
self.IBtblUserFeed.setContentOffset(offSet, animated: false)
}
}
} else {
isDataLoading = false
DispatchQueue.main.async {
if (self.isFromRefresh) {
self.IBtblUserFeed.reloadData()
} else {
UIView.setAnimationsEnabled(false)
self.IBtblUserFeed.reloadData()
self.IBtblUserFeed.layoutIfNeeded()
self.IBtblUserFeed.setContentOffset(offSet, animated: false)
UIView.setAnimationsEnabled(true)
}
}
}
} else {
self.arrRestaurants = arrRestaurant
if arrRestaurant.count % 10 != 0 {
isDataLoading = false
actInd.stopAnimating()
}
if self.arrRestaurants.count == 0 {
self.IBtblUserFeed.tableHeaderView = nil
self.IBtblUserFeed.tableHeaderView?.isHidden = true
} else {
if filterBy.isFiltering{
} else {
self.IBtblUserFeed.tableHeaderView = self.header()
}
self.IBtblUserFeed.tableHeaderView?.isHidden = false
}
if filterBy.isFiltering{
self.reloadTableView()
// tejas changes
// filterRestaurant(filterBy: filterBy)
}else{
self.reloadTableView()
}
}
}

Answer 1

Your example code is too cluttered with unrelated things to give a solid answer; however, I think that the problem is related to the use of reloadData; you should instead use insertRows(at:with:) to get smoothly appended rows.
So whenever you append restaurant model objects to your array (from the code it looks like you never apply other changes like modifications or removals), generate the index paths of the new rows ...
let indexPaths = (countBeforeAdding..<countAfterAdding).map { IndexPath.init(row: $0, section: 0) }
... and insert them into the table view:
tableView.beginUpdates()
tableView.insertRows(at: indexPaths, with: .automatic)
tableView.endUpdates()