Why isn’t my custom UITableView cell showing? - ios

Question

I’ve implemented a custom cell for a UITableView, but when I run the Playground it’s just a standard table. It’s probably something stupid simple, but I’m very new to UIKit and somewhat new to Swift.
Also, I’ve tried to implement a “sticky header”, but no matter what I try the header scrolls with the rest of the table.
import UIKit
import PlaygroundSupport
class ViewController : UIViewController, UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 19
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: CardCell = tableView.dequeueReusableCell(withIdentifier: "CardCell", for: indexPath) as! CardCell
cell.messageLabel.text = "yo"
return cell
}
var convoTableView = UITableView()
override func viewDidLoad(){
super.viewDidLoad()
convoTableView = UITableView(frame: self.view.bounds, style:
UITableView.Style.plain)
convoTableView.backgroundColor = UIColor.white
convoTableView.register(CardCell.self, forCellReuseIdentifier: "CardCell")
let header = UIView(frame: CGRect(x: 0, y: 0, width: convoTableView.frame.width, height: 100))
header.backgroundColor = .red
self.convoTableView.delegate = self
self.convoTableView.dataSource = self
let yourLabel = UILabel(frame: CGRect(x: 10, y: 0, width: 100, height: 100))
yourLabel.textColor = UIColor.black
yourLabel.backgroundColor = UIColor.white
yourLabel.text = "mylabel text"
header.addSubview(yourLabel)
convoTableView.tableHeaderView = header
convoTableView.estimatedSectionHeaderHeight = 40.0
self.view.addSubview(convoTableView)
}
}
class CardCell: UITableViewCell {
let messageLabel:UILabel = {
let label = UILabel()
label.font = UIFont.boldSystemFont(ofSize: 14)
label.clipsToBounds = true
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let dateLabel:UILabel = {
let label = UILabel()
label.font = UIFont.boldSystemFont(ofSize: 8)
label.clipsToBounds = true
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let containerView:UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.clipsToBounds = true
return view
}()
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
containerView.addSubview(messageLabel)
containerView.addSubview(dateLabel)
self.contentView.addSubview(containerView)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
PlaygroundPage.current.liveView = ViewController()

Answer 1

Here's all the code you need here to make a custom cell and sticky header:
import UIKit
import PlaygroundSupport
class ViewController: UITableViewController {
override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let view = UIView()
view.backgroundColor = .purple
return view
}
override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
50
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
19
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CardCell", for: indexPath) as! CardCell
cell.textLabel?.text = "\(indexPath.row)"
return cell
}
override func viewDidLoad(){
super.viewDidLoad()
tableView.register(CardCell.self, forCellReuseIdentifier: "CardCell")
}
}
class CardCell: UITableViewCell { }
PlaygroundPage.current.liveView = ViewController()

Answer 2

To make the header sticky and non-scrollable with the table view you need to take a different UIView above the table view and give the frames of the table just below the UiView.
customView = MyCustomView(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
self.view.addSubview(customView