How to add a full-screen gradient background in an iOS app using Swift?

Hi everyone! I'm a beginner in iOS development with Swift and I've run into a problem. I want to create a beautiful gradient background for the entire screen in my app. I've heard about CAGradientLayer, but I can't figure out how to properly apply it to the controller's background view. Here's what I tried: ```swift import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let gradientLayer = CAGradientLayer() gradientLayer.colors = [UIColor.blue.cgColor, UIColor.purple.cgColor] gradientLayer.locations = [0.0, 1.0] gradientLayer.frame = self.view.bounds self.view.layer.addSublayer(gradientLayer) } } ``` But the gradient displays incorrectly — it doesn't fill the entire screen, especially when rotating