prefetchRowsAt not called for last rows - ios

Question

I am facing one issue in the UITableViewDataSourcePrefetching implementation.
I have 62 records total in the cloud and I am calling the API which returns 15 records per page.
I have implemented the prefetchRowsAt method as well which partially works fine for me.
The issue is the above method does not return all the indexPath it is going to load so as you can see from below logs it goes up to 53 only and in my table view it shows 60 records only.
Indexpaths to fetch : [[3, 51], [3, 42], [3, 52], [3, 41], [3, 53], [3, 40], [3, 54], [3, 39], [3, 55], [3, 38], [3, 56], [3, 37], [3, 57], [3, 36], [3, 58], [3, 35], [3, 59], [3, 34], [3, 60], [3, 33]]
Indexpaths to fetch : [[3, 51], [3, 50], [3, 49], [3, 48], [3, 47], [3, 46], [3, 45], [3, 44], [3, 43]]
Indexpaths to fetch : [[3, 52]]
Indexpaths to fetch : [[3, 53]]
Here is my method implementation
extension MyViewController:UITableViewDataSourcePrefetching{
func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
#if DEBUG
print("Indexpaths to fetch : \(indexPaths)")
#endif
if indexPaths.contains(where: isLoadingCell) {
self.loadFurthersSessionNotification?()
}
}
}
private extension MyViewController {
func isLoadingCell(for indexPath: IndexPath) -> Bool {
if indexPath.section != 3{
return false
}
return (indexPath.row - 1) >= self.aryCloudObjects.count
}
}
Any help will be appreciated.
Thanks

Answer 1

There is nothing unexpected with the behaviour you are seeing. There is no guarantee that prefetchRowsAt will be called for every row in your table.
From the documentation:
Table views do not call this method for cells they require immediately, so your data source object must also be able to fetch the data itself.
Prefetching allows you to be prepared to display rows, but if the data hasn't been prefetched when cellForRowAt: is called then you need to fetch the data then.