popover controller with tableview in swift

Question

I have a TableView with a bar button item. When I click bar button it's show the PopOver menu. when I click the Popover menu items perform some actions (like tableview data with specific items) I want use PopOver menu as a Filter type:

This is the code :

View Controller code

@IBAction func ButtonClick(_ sender: UIBarButtonItem) {
     self.performSegue(withIdentifier: "POP1", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier ==  "POP1"            
    {
        let dest = segue.destination

        if let pop =  dest.popoverPresentationController
        {                
            pop.delegate = self
        }
    }
}

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    return .none
}

 func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return fruits.count
}

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

    let fruitName = fruits[indexPath.row]
    cell.textLabel?.text = fruitName

    return cell
}

PopOVER Code:

override func numberOfSections(in tableView: UITableView) -> Int {

    return 1

}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
           return data.count

}


override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "POP", for: indexPath)

    cell.textLabel?.text = data[indexPath.row]
    return cell
}


override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    var selectedItem = indexPath
    print (selectedItem.row)

}

when I click one in Popover menu it should show the count of words starting with each letter (1 from A, 2 from B) displayed on view controller table view.

Answer 1

You can use either a completion closure or delegate method to achieve your goal. This is a useful lib using completion closure with generic data type for you to freely get/set table view data source as key-value tuples.

For delegation, you can do something as follows:

protocol PopoverViewControllerDelegate: class {
    func didSelectData(_ result: String)
}

class PopoverViewController: UIViewController {
    weak var delegate: PopoverViewControllerDelegate?

    //...

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        dismiss(animated: true, completion: nil)
        let selectedItem = arrayData[indexPath.row]
        delegate?.didSelectData(selectedItem)
    }
}

and then in your current view controller:

class ViewController: UIViewController, PopoverViewControllerDelegate {

    // ...

    func didSelectData(_ result: String) {
        // Update fruits array
        tableView.reload()
    }
}