Change the layout margins of a UITableViewController programmatically

Question

The first image is how my cells are currently and the second image is how I want them to be. I have a UITableViewController and want to programmatically change the layout margins however it does not work

override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = UIColor(named: "Gray")
    tableView.backgroundColor = UIColor(named: "Gray")
    tableView.contentInset.top = .padding
    tableView.separatorStyle = .none
    tableView.register(TaskCell.self, forCellReuseIdentifier: "taskCell")
    tableView.layoutMargins = .init(top: 0, left: 20, bottom: 0, right: 20) // Does not work
}

Answer 1

Put a UIView inside the cell as background view and give margins to that view by adjusting its size in the storyboard. Then change the colour opacity of the cell's content view to 0