I hope this can help you. func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) - UIView {     if #available(iOS 14.0, *) {       let height: CGFloat = 0.5       for subview in pickerView.subviews {         /* smaller than the row height plus 20 point, such as 40 + 20 = 60*/         if subview.frame.size.height 60 {           if subview.subviews.isEmpty {             let topLineView = UIView()             topLineView.frame = CGRect(x: 0.0, y: 0.0, width: subview.frame.size.width, height: height)             topLineView.backgroundColor = .lightGray             subview.addSubview(topLineView)             let bottomLineView = UIView()             bottomLineView.frame = CGRect(x: 0.0, y: subview.frame.size.height - height, width: subview.frame.size.width, height: height)             bottomLineView.backgroundColor = .lightGray             subview.addSubview(bottomLineView)           }         }         subview.backgroundColor = .clear       }     }     let label = UILabel()     return label   }