Setup default row in tableView - ios

Question

I have a problem with setup default row in TableView. I just wanna always pick first element from dataSource. I tried a few solutions with "selectRow" and other but no one of them work.
Here's my code below:
class HomeVC: UIViewController{
#IBOutlet weak var btnSelectCountry: UIButton!
let transparentView = UIView()
let tableView = UITableView()
var selectedButton = UIButton()
var dataSource = [String]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.register(CellClass.self, forCellReuseIdentifier: "Cell")
let index = NSIndexPath(row: 0, section: 0)
tableView.selectRow(at: index as IndexPath, animated: true, scrollPosition: .bottom)
}
func addTransparentView(frames: CGRect){
let window = UIApplication.shared.keyWindow
transparentView.frame = window?.frame ?? self.view.frame
self.view.addSubview(transparentView)
tableView.frame = CGRect(x: frames.origin.x, y: frames.origin.y + frames.height, width: frames.width, height: 0 )
self.view.addSubview(tableView)
tableView.layer.cornerRadius = 5
transparentView.backgroundColor = UIColor.black.withAlphaComponent(0.9)
tableView.reloadData()
let tapgesture = UITapGestureRecognizer(target: self, action: #selector(removeTransparentView))
transparentView.addGestureRecognizer(tapgesture)
transparentView.alpha = 0
UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveEaseInOut, animations: {
self.transparentView.alpha = 0.5
self.tableView.frame = CGRect(x: frames.origin.x, y: frames.origin.y + frames.height + 5, width: frames.width, height: CGFloat(self.dataSource.count * 50))
}, completion: nil)
}
}
extension HomeVC: UITableViewDelegate, UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dataSource.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = dataSource[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedButton.setTitle(dataSource[indexPath.row], for: .normal)
removeTransparentView()
}

Answer 1

Try replacing viewDidLoad() with this
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.register(CellClass.self, forCellReuseIdentifier: "Cell")
let index = IndexPath(row: 0, section: 0)
tableView(tableView, didSelectRowAt: index)
}
This will automatically trigger the didSelectRow method but you need to populate your dataSource before this or the application will crash.
You can try adding this for example in viewWillAppear()
override func viewWillAppear(_ animated: Bool) {
dataSource = ["Your", "Data"]
}