I am trying a add a subview to the UISlider Thumb. This worked until iOS 14         if let redView = redO.subviews.last as? UIImageView  {             let label = UILabel(frame: redView.bounds)             label.backgroundColor = .clear             label.textAlignment = .center             redView.addSubview(label)  }   This used to work. Does any one know how to get the Thumb subview in iOS 14?