Segmented control is only working on first press - swift

Question

I want to give the option to change the background of my app.
Everything is working fine when I want to change the background colour only. But I have to use a background image.
I am using the code below for that
import UIKit
class ContainerController: UIViewController {
var isRaindrops = false
var Background:String = "UIImage(named: \"Background\")"
override func viewDidLoad() {
super.viewDidLoad()
BackgroundSwitch()
self.view.backgroundColor = .white
}
func BackgroundSwitch() {
let items = ["Gradient", "Raindrops"]
let segmentedControl = UISegmentedControl(items: items)
segmentedControl.translatesAutoresizingMaskIntoConstraints = false
segmentedControl.frame = CGRect(x: 20, y: self.view.frame.height * 0.2 + 50, width: self.view.frame.width - 40, height: 40)
segmentedControl.selectedSegmentIndex = 0
segmentedControl.tintColor = UIColor.black
segmentedControl.addTarget(self, action: #selector(segmentedControlInAction(sender:)), for: UIControl.Event.valueChanged)
self.view.addSubview(segmentedControl)
}
#objc func segmentedControlInAction(sender:UISegmentedControl) {
let index = sender.selectedSegmentIndex
switch index {
case 0:
print("Gradient")
Background = "Background"
print(Background)
// self.view.backgroundColor = .red
BackgroundSetup()
case 1:
(print("Raindrops"))
Background = "Raindrops"
print(Background)
// self.view.backgroundColor = .blue
BackgroundSetup()
default:
print("default")
break
}
}
func BackgroundSetup() {
let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: Background)
self.view.insertSubview(backgroundImage, at: 0)
// self.view.backgroundColor = Background
}
}
With the code that I have at the moment, the background is only changing when I hit the "Raindrops" field for the first time.

Answer 1

I have a segmented tableview which I use both case switch and if like below.
if sender.selectedSegmentIndex == 0
{
print("Gradient")
Background = "Background"
print(Background)
BackgroundSetup()
}
if sender.selectedSegmentIndex == 1
{
(print("Raindrops"))
Background = "Raindrops"
print(Background)
BackgroundSetup()
}