iOS Swift customize UITableView separator programmatically

hide the UITableView cell row separator

myTableView.separatorStyle = .none

hide empty cells at the bottom of the UITableView

myTableView.tableFooterView = UIView()

adjust UITableView separator inset from left or right side

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
        -> UITableViewCell {
       
        let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell",
                            for: indexPath as IndexPath)
        cell.textLabel!.text = "\(myArray[indexPath.row])"
        
        cell.separatorInset = UIEdgeInsets.init(top: 0.0, left: 25.0, bottom: 0.0, right: 25.0)
        cell.layoutMargins = UIEdgeInsets.init(top: 0.0, left: 100.0, bottom: 0.0, right: 0.0)
            
            
        return cell
    }

create UITableView custom separator

import UIKit

class CustomCell: UITableViewCell {

    let myLabel = UILabel()
    let mySeparator = UIView()
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        mySeparator.layer.borderColor = UIColor.green.cgColor
        mySeparator.layer.borderWidth = 2.0
        mySeparator.translatesAutoresizingMaskIntoConstraints = false
        myLabel.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(mySeparator)
        contentView.addSubview(myLabel)
        
        let views = [
            "contentView" : contentView,
            "label" : myLabel,
            "separator" : mySeparator
            ]
        
        var allConstraints: [NSLayoutConstraint] = []
        allConstraints += NSLayoutConstraint.constraints(withVisualFormat:
            "V:|-[label]-[separator(2)]|", options: [], metrics: nil, views: views)
        allConstraints += NSLayoutConstraint.constraints(withVisualFormat:
            "H:|-[label]-|", options: [], metrics: nil, views: views)
        allConstraints += NSLayoutConstraint.constraints(withVisualFormat:
            "H:|-[separator]|", options: [], metrics: nil, views: views)
        NSLayoutConstraint.activate(allConstraints)
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }

}

Source for UITableView controller

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    //my sample data for table view
    private let myArray: NSArray = [
        "This is Row# 1",
        "This is Row# 2",
        "This is Row# 3",
        "This is Row# 4"]
    private var myTableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationItem.title = "Main View"
        
        myTableView = UITableView()
        myTableView.register(CustomCell.self, forCellReuseIdentifier: "MyCell")
        myTableView.dataSource = self
        myTableView.delegate = self
        myTableView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myTableView)
        
        //hide empty rows at the bottom
        myTableView.tableFooterView = UIView()
        
        //hide separator lines
        myTableView.separatorStyle = .none
        
        //auto layout for the table view
        let views = ["view": view!, "tableView" : myTableView]
        var allConstraints: [NSLayoutConstraint] = []
        allConstraints += NSLayoutConstraint.constraints(withVisualFormat:
            "V:|[tableView]|", options: [], metrics: nil, views: views as [String : Any])
        allConstraints += NSLayoutConstraint.constraints(withVisualFormat:
            "H:|[tableView]|", options: [], metrics: nil, views: views as [String : Any])
        NSLayoutConstraint.activate(allConstraints)
        
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("Num: \(indexPath.row)")
        print("Value: \(myArray[indexPath.row])")
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int)
        -> Int {
        return myArray.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
        -> UITableViewCell {
       
        let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell",
                                for: indexPath as IndexPath) as! CustomCell
        cell.myLabel.text = "\(myArray[indexPath.row])"
        
        //cell.separatorInset = UIEdgeInsets.init(top: 0.0, left: 25.0, bottom: 0.0, right: 25.0)
        //cell.layoutMargins = UIEdgeInsets.init(top: 0.0, left: 100.0, bottom: 0.0, right: 0.0)
            
            
        return cell
    }

}