How to get a UITableview to go to the top of page on reload?

Question

I am trying to get a UITableview to go to the top of the page when I reload the table data when I call the following from

- (void)pickerView:(UIPickerView *)pic         


        

Answer 1

After considering the options discussed above my version of the solutions is the following. It works consistently in iOS 11 & 12 for both UICollectionView & UITableView.

UICollectionView:

DispatchQueue.main.async { [weak self] in
    guard self?..first != nil else { return }

    self?.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0),
                               at: .top,
                                     animated: false)
}

UITableView:

DispatchQueue.main.async { [weak self] in
    guard self?..first != nil else { return }

    self?.collectionView.scrollToRow(at: IndexPath(row: 0, section: 0),
                               at: .top,
                                     animated: false)
}