How to get UITableView to be positioned within the safe area - ios

Question

I am trying to get my UITableView to be positioned within the safe area but it doesn't seem to be working and I do not know why. I trying to do this programatically.
class MenuTableViewController: UITableViewController{
var margin: UILayoutGuide!
var tableDataSource: [userFolderObject]!
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
setup()
}
private func setup(){
margin = view.layoutMarginsGuide
tableDataSource = MockData.UITableDateSource
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.topAnchor.constraint(equalTo: margin.topAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: margin.bottomAnchor).isActive = true
tableView.leadingAnchor.constraint(equalTo: margin.leadingAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: margin.trailingAnchor).isActive = true
/* I have also tried the below code
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
tableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
*/
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
}
override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let label = UILabel()
label.backgroundColor = UIColor.lightGray
if section == 0{
label.text = "Search PubMed"
}else{
label.text = "My Folders"
}
return label
}
}

Answer 1

First, remove all of your setup code that attempts to mess with the margins of the table view. That is all done for you by default in a UITableViewController.
Since your issue is only with the layout of your custom section header views, you need to fix how you have implemented those views.
Like cells, you should use reusable header/footer views and your header/footer view should extend UITableViewHeaderFooterView. This will ensure proper margins by defaults and it already provides a standard textLabel you can set. No need to create your own UILabel.
As shown in the documentation for UITableViewHeaderFooterView you should register a class. Then in viewForHeader you should dequeque the header view and then set its textLabel as needed.
If you don't actually need anything but a plain old section label, then don't implement viewForHeader. Instead, implement titleForHeader. Much simpler.