TableView limit use (Swift) - ios

Question

Hello i have two viewControllers, the first with a stepper
var steppers : UIStepper?
#IBOutlet weak var hourLabel: UILabel!
#IBAction func stepper(_ sender: UIStepper) {
hourLabel.text = String(sender.value)
}
and the second with a tableView
import UIKit
import AVFoundation
class SelectClass: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var list : [QCategoryy] = [QCategoryy]()
var audioPlayer : AVAudioPlayer!
var limit = 3
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.allowsMultipleSelection = true
self.title = "Categories"
list = NearbyPlaces.getCategories()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
list.sort() { $0.views > $1.views}
tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func backTapp(_ sender: Any) {
let audioUrl = NSURL.fileURL(withPath: Bundle.main.path(forResource: "pop_drip", ofType: "m4a")!)
do{
try AVAudioSession.sharedInstance().setActive(true)
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try audioPlayer = AVAudioPlayer(contentsOf: audioUrl)
audioPlayer.prepareToPlay()
audioPlayer.play()
}
catch _ as NSError
{
}
dismiss(animated: true, completion: nil)
}
#IBAction func doneTapp(_ sender: Any) {
let audioUrl = NSURL.fileURL(withPath: Bundle.main.path(forResource: "pop_drip", ofType: "m4a")!)
do{
try AVAudioSession.sharedInstance().setActive(true)
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try audioPlayer = AVAudioPlayer(contentsOf: audioUrl)
audioPlayer.prepareToPlay()
audioPlayer.play()
}
catch _ as NSError
{
}
self.performSegue(withIdentifier: nearbySearchSegueIdentifier, sender: nil)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return list.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let identifier = "CATEGORY_CELL"
let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
let selectedIndexPaths = tableView.indexPathsForSelectedRows
let rowIsSelected = selectedIndexPaths != nil && selectedIndexPaths!.contains(indexPath)
/* cell.accessoryType = rowIsSelected ? .checkmark : .none */
cell.accessoryType = list[indexPath.row].isSelected ? .checkmark : .none
cell.textLabel?.text = list[indexPath.row].name
return cell
}
let nearbySearchSegueIdentifier = "goToMcourse"
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)!
cell.accessoryType = .checkmark
/* self.performSegue(withIdentifier: nearbySearchSegueIdentifier, sender: list[indexPath.row]) */
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)!
cell.accessoryType = .none
}
func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
if let sr = tableView.indexPathsForSelectedRows {
if sr.count == limit {
let alertController = UIAlertController(title: "Oops", message:
"You are limited to \(limit) selections", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: {action in
}))
self.present(alertController, animated: true, completion: nil)
return nil
}
}
return indexPath
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == nearbySearchSegueIdentifier {
guard let category = sender as? QCategoryy else {
return
}
if let selectedRows = tableView.indexPathsForSelectedRows {
if let vc = segue.destination as? CourseClass2 {
vc.category = category
}
}
}
}
}
extension QCategoryy {
private static let ketPrefix = "category-"
var views:Int {
get {
return UserDefaults.standard.integer(forKey: QCategoryy.ketPrefix + name)
}
}
func markView() {
UserDefaults.standard.set(views + 1, forKey: QCategoryy.ketPrefix + name)
}
}
in this tableView i can select multiple cells and add a limit to the selection with the var
var limit = 3
and the func
func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
if let sr = tableView.indexPathsForSelectedRows {
if sr.count == limit {
let alertController = UIAlertController(title: "Oops", message:
"You are limited to \(limit) selections", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: {action in
}))
self.present(alertController, animated: true, completion: nil)
return nil
}
}
return indexPath
}
but what i would like to do is to use the stepper in the first viewController to add the limit at the selection of the tableView (in the second viewController), something like
How can i do it?

Answer 1

In the VC with the stepper, override prepareForSegue:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let vc = segue.destination as? SelectClass {
vc.limit = Int(stepper.value)
}
}
EDIT: You need to make the stepper an outlet of the VC, change the the declaration to this first:
#IBOutlet var stepper: UIStepper!
In the storyboard, right click on your view controller (the one with the yellow icon):
Then this appears:
See the stepper under "Outlets"? Drag from the circle besides the stepper to the stepper on your storyboard: