How to use two tableview in one view? - macos

Question

I have two table view in one view container. I insert each of them to the container.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: false)
self.storyboard?.instantiateViewController(withIdentifier: "ChildTableView") as! ChildTableViewController
childTV.updateTable(id: indexPath.row)
}
I need to update second tableview when first tableview cell clicked.
How i can do this?

Answer 1

Okay, I think I see the problem. The way you've done this is with two UITableViewControllers and their table views. So now you have a problem communicating between the two table view controllers. But consider this: if you've truly created child view controllers, the table view controllers are children of the same parent. So the first table view controller can get its parent view controller, then get the parent's child view controllers, then get the second child view controller, and that must be the second table view controller.
In other words, if your view controller hierarchy is:
ParentViewController
TableViewController1
TableViewController2
... then TableViewController1 can say:
let tvc2 = self.parent!.childViewControllers[1] as! TableViewController2
... and now you have established a line of communication between them. So now table view controller 1 can talk to table view controller 2 and tell it to update its table. You will need to have a method in table view controller 2 that table view controller 1 can call, in order to hand it any needed data and tell it what to do.

Answer 2

in Second TableView:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ChildTableViewController.updateTable(sender:)), name: NSNotification.Name(rawValue: "updateChild"), object: nil)
}
func updateTable(sender:NSNotification){
tableView.reloadData()
}
in First TableView:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: false)
selectedItem["id"]=indexPath.row
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "updateChild"),object:selectedItem)
}