I cannot able to add subview to UItableviewcell - swift

Question

Code
import UIKit
class ViewController:
UIViewController,UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var suma=UITableViewCell()
var sampleviewpurple=UIView(frame: CGRect(x: suma.frame.width/0, y: 0, width: suma.frame.width/2, height: suma.frame.height))
sampleviewpurple.backgroundColor=#colorLiteral(red: 0.2196078449, green: 0.007843137719, blue: 0.8549019694, alpha: 1)
var sampleviewred=UIView(frame: CGRect(x: suma.frame.width/1, y: 0, width: suma.frame.width/2, height: suma.frame.height))
sampleviewred.backgroundColor=#colorLiteral(red: 0.8078431487, green: 0.02745098062, blue: 0.3333333433, alpha: 1)
suma.contentView.addSubview(sampleviewpurple)
suma.contentView.addSubview(sampleviewred)
return suma
}
#IBOutlet weak var tab: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tab.dataSource=self
tab.delegate=self
}
}
when I try to add a subview to the suma and return to the delegate, My table view is still blank, I am returning valid data source to the data source when and also noticed the reference to the table view all is fine, But still how I can not able to add a subview to the uitableviewcell

Answer 1

In the cellForRowAt function, you must dequeue your table cell, not instantiate UITableViewCell:
var suma = tableView.dequeueReusableCell(withIdentifier: "YOUR_CELL_IDENTIFIER")

Answer 2

For setting your view's frame you are using the cell's frame which is not set yet. You should use such a view which frame is already set and on which bases you want to calculate the frame of your new views.
Try this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var sumaCell:UITableViewCell?
sumaCell = tableView.dequeueReusableCell(withIdentifier: "sumaCell")
if sumaCell == nil {
sumaCell = UITableViewCell(style: .default, reuseIdentifier: "sumaCell")
}
var sampleviewpurple=UIView(frame: CGRect(x: 0, y: 0, width: ((sumaCell?.frame.width)!/2), height: (sumaCell?.frame.height)!))
sampleviewpurple.backgroundColor=#colorLiteral(red: 0.2196078449, green: 0.007843137719, blue: 0.8549019694, alpha: 1)
var sampleviewred=UIView(frame: CGRect(x: (sumaCell?.frame.width)!/2, y: 0, width: ((sumaCell?.frame.width)!/2), height: (sumaCell?.frame.height)!))
sampleviewred.backgroundColor=#colorLiteral(red: 0.8078431487, green: 0.02745098062, blue: 0.3333333433, alpha: 1)
sumaCell?.contentView.addSubview(sampleviewpurple)
sumaCell?.contentView.addSubview(sampleviewred)
return sumaCell!
}

Answer 3

You are creating the cell in code. First of all, you have to register the UITableViewCell in viewDidLoad method.
tab.register(UITableViewCell.self, forCellReuseIdentifier: "DefaultCell")
Then you have to use the dequeue cell in cellForRowAt method.
var suma = tab.dequeueReusableCell(withIdentifier: "DefaultCell")
If you are instantiating the cell from storyboard, you just have to use dequeue cell. No need to register.

Answer 4

I made three change.
Dequeue the cell for reusability.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var suma = UITableViewCell()
suma = tab.dequeueReusableCell(withIdentifier: "DefaultCell")!`
Changed the sampleviewpurple and sampleviewred x position
let sampleviewpurple = UIView(frame: CGRect(x: 0, y: 0, width: suma.frame.width/2, height: suma.frame.height))
let sampleviewred = UIView(frame: CGRect(x: suma.frame.width/2, y: 0, width: suma.frame.width/2, height: suma.frame.height))
Registered the cell which is created programmatically to create a connection between UITableView and UITableViewCell in viewDidLoad function
tab.register(UITableViewCell.self, forCellReuseIdentifier: "DefaultCell")