swift 5 change all view controller background color code example

Example 1: swift change background color

self.view.backgroundColor = UIColor.red

Example 2: how to change background color of stackview swift

extension UIStackView {
    func addBackground(color: UIColor) {
        let subView = UIView(frame: bounds)
        subView.backgroundColor = color
        subView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        insertSubview(subView, at: 0)
    }
}