UITableView doesn't show anything - ios

Question

I wrote an app that it have a UITableView in UIViewController and here is my codes:
class CategorySelectViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var melliSubCategories = [String]()
var mazhabiSubCategories = [String]()
var sayerSubCategories = [String]()
#IBOutlet weak var melliButton: UIButton!
#IBOutlet weak var sayerButton: UIButton!
#IBOutlet weak var mazhabiButton: UIButton!
#IBAction func melliButtonClicked(_ sender: UIButton) {
categorySelected = 6
melliButton.isHighlighted = true
mazhabiButton.isHighlighted = false
sayerButton.isHighlighted = false
categoryTableView.reloadData()
}
#IBAction func sayerButtonClicked(_ sender: UIButton) {
categorySelected = 5
melliButton.isHighlighted = false
mazhabiButton.isHighlighted = false
sayerButton.isHighlighted = true
categoryTableView.reloadData()
}
#IBAction func mazhabiButtonClicked(_ sender: UIButton) {
categorySelected = 4
melliButton.isHighlighted = false
mazhabiButton.isHighlighted = true
sayerButton.isHighlighted = false
categoryTableView.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
categoryTableView.dataSource = self
categoryTableView.delegate = self
categoryTableView.register(CategorySelectTableViewCell.self, forCellReuseIdentifier: "Cell")
melliSubCategories = DataBaseManager.shared.subCategories(6)
mazhabiSubCategories = DataBaseManager.shared.subCategories(4)
sayerSubCategories = DataBaseManager.shared.subCategories(5)
print(melliSubCategories)
print("/////////////////")
print(mazhabiSubCategories)
print("/////////////////")
print(sayerSubCategories)
print("/////////////////")
}
#IBOutlet weak var categoryTableView: UITableView!
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
switch categorySelected {
case 4: //mazhabi
return mazhabiSubCategories.count
case 5: //sayer
return sayerSubCategories.count
case 6: //melli
return melliSubCategories.count
default:
return melliSubCategories.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath as IndexPath) as! CategorySelectTableViewCell
cell.label?.text = melliSubCategories[indexPath.row]
return cell
}
And I create a class named CategorySelectTableViewCell for cells in table view that they have an image and a label.
In code I fill the arrays by database and I want to show them in the table view but the tableview doesn't show anything.
the screenshot : my storyboard, demo

Answer 1

You are saying:
cell.label?.text = melliSubCategories[indexPath.row]
It is impossible for this to work. For it to work, your custom cell type CategorySelectTableViewCell would need to be in a nib with a label outlet. But then that nib is either in a storyboard or a xib file. But you are also saying
categoryTableView.register(CategorySelectTableViewCell.self, ...
That line prevents the cell from coming from the xib or the storyboard. So the outlet cannot work and the cell will remain empty.

Answer 2

Please check array count is Zero or not in below numberOfRowsInSection method.
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
Also, cross-check cell identifier is correct or not.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell : CategorySelectTableViewCell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath as IndexPath) as! CategorySelectTableViewCell
cell.label?.text = melliSubCategories[indexPath.row]
return cell
}
Reload tableview in ViewDidLoad method:
categoryTableView.reloadData()
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view.
categoryTableView.dataSource = self
categoryTableView.delegate = self
categoryTableView.register(CategorySelectTableViewCell.self, forCellReuseIdentifier: "Cell")
melliSubCategories = DataBaseManager.shared.subCategories(6)
mazhabiSubCategories = DataBaseManager.shared.subCategories(4)
sayerSubCategories = DataBaseManager.shared.subCategories(5)
print(melliSubCategories)
print("/////////////////")
print(mazhabiSubCategories)
print("/////////////////")
print(sayerSubCategories)
print("/////////////////")
categoryTableView.reloadData()
}