Automatically set focus to first cell of UITableView when view loads - swift

Question

I have been trying to make an application where when the view loads, the focus automatically goes to first cell of UITableview.
I have tried using the UIFocusGuide and then in prefferedFocusView() method return the tableView but that did not work.
I then wrote this code
var viewToFocus: UIView? = nil {
didSet {
if viewToFocus != nil {
print("called1 ")
self.setNeedsFocusUpdate();
self.updateFocusIfNeeded();
}
}
}
override weak var preferredFocusedView: UIView? {
if viewToFocus != nil {
print("called2 ")
return viewToFocus;
} else {
return super.preferredFocusedView;
}
}
In view did load
self.viewToFocus = myTableView
But that did not work as well.

Answer 1

I was able to get this by setting tableView.remembersLastFocusedIndexPath = true in viewDidLoad, then I implemented the delegate method for preferred focus:
func indexPathForPreferredFocusedView(in tableView: UITableView) -> IndexPath? {
return NSIndexPath(forItem: 0, inSection: 0)
}
When remembersLastFocusedIndexPath - If YES, when focusing on a table view the last focused index path is focused automatically. If the table view has never been focused, then the preferred focused index path is used.
Swift 5
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
myTableView.remembersLastFocusedIndexPath = true
}
and then in your delegate
func indexPathForPreferredFocusedView(in tableView: UITableView) -> IndexPath? {
return IndexPath(row: 0, section: 0)
}

Answer 2

Add the following code snippet to the implementation of the ViewController class with the tableview delegate invoked:
func tableView(tableView: UITableView, canFocusRowAtIndexPath indexPath: NSIndexPath) -> Bool {
if indexPath.row == 0 {
return true
}
return false
}

Answer 3

In tableView:WillDisplayCell method add below code
[cell setSelected:YES animated:NO];
for first cell

Answer 4

You can set the scroll position automatically to go to the top cell.
let topCell:NSIndexPath = NSIndexPath(forRow: 0, inSection: 0)
self.tableView.scrollToRowAtIndexPath(topCell, atScrollPosition: UITableViewScrollPosition.None, animated: true)
I am not sure if this is the same behaviour as preferredFocusedViewthough.

Answer 5

extension UITableView {
func scrollToTop(section: Int) {
let rows = self.numberOfRows(inSection: section)
if rows > 0 {
DispatchQueue.main.async {
let indexPath = IndexPath(row: rows - 1, section: section)
self.scrollToRow(at: indexPath, at: .top, animated: true)
}
}
}
}
if there is only one section replace section with 0