Adjust popOverViewController to the size of the label.text - ios

Question

So i have a popover yet i cant manage to configure the right size:
So this is the popover class:
final class PopOverViewController: UIViewController {
#IBOutlet weak var lbl: UILabel!
var text: String?
init(text: String) {
super.init(nibName: "PopOverViewController", bundle: nil)
self.text = text
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
lbl.text = text
//lbl.sizeToFit()
// self.view.frame = lbl.frame
}
}
The label is align to x and y center.
The invoke is :
fileprivate func showTipIfNedded() {
let optionItemListVC = PopOverViewController(text: "qewlghsflgha;lgh;lkfgj")
optionItemListVC.modalPresentationStyle = .popover
optionItemListVC.view.backgroundColor = .red
if let popover = optionItemListVC.popoverPresentationController {
popover.sourceView = self.view
popover.permittedArrowDirections = .down
//popover.containerView?.backgroundColor = .red
guard let firstTab = tabBarController?.tabBar.items?[0].value(forKey: "view") as? UIView else { return }
popover.sourceRect = CGRect(x: firstTab.frame.midX, y: (self.tabBarController?.tabBar.frame.minY)!, width: 1, height: 1)
optionItemListVC.preferredContentSize = CGSize(width: optionItemListVC.lbl.frame.width, height: optionItemListVC.lbl.frame.height)
popover.delegate = self
}
self.present(optionItemListVC, animated: true, completion: nil)
}
With the current constraint the vc is small an i cant see the whole text, with constraint thet are 50 to all side the vc is to big, more then needed.
What constraints must i build? and are there more things i should config?

Answer 1

In your PopoverViewController override preferredContentSize to control the size of the view controller, something like this:
import UIKit
class PopoverViewController: UIViewController
{
#IBOutlet weak var lbl: UILabel!
override func viewDidLoad()
{
super.viewDidLoad()
...
}
// Preferred content size
override var preferredContentSize: CGSize
{
get
{
// measure
let maxLabel: CGSize = CGSize.init(width: lbl.frame.size.width, height: CGFloat.greatestFiniteMagnitude)
let fittingSize: CGSize = lbl.sizeThatFits(maxLabel)
// add some margins/padding, margins = 8 horizontal = 12 vertical
return CGSize.init(width: fittingSize.width + 16, height: fittingSize.height + 24)
}
set
{
super.preferredContentSize = newValue
}
}
}
The getter measures the size of the UILabel (assuming its already populated with text), adding some vertical and horizontal padding