自定义tableView左滑删除按钮

import UIKit

class RefreshAndEditingTableView: RefreshTableView {

    override func layoutSubviews() {
        super.layoutSubviews()
        
        if #available(iOS 11.0, *) {
            for subview in self.subviews where subview.isKind(of: NSClassFromString("UISwipeActionPullView")!) {
                subview.backgroundColor = RGBA(242, g: 242, b: 242, a: 1)
                
                for view in subview.subviews where view.isKind(of: NSClassFromString("UISwipeActionStandardButton")!) {
                    
                    view.backgroundColor = RGBA(242, g: 242, b: 242, a: 1)
                    
                    let deleteBtn = setupDeleteBtn(frame: CGRect(x: 0, y: 0, width: 80, height: view.bounds.height))
                    view.addSubview(deleteBtn)
                    view.bringSubviewToFront(deleteBtn)
                }
            }
            
        } else {    // IOS 10以及以下
            for subview in subviews where subview.isKind(of: NSClassFromString("UITableViewCellDeleteConfirmationView")!) {
                subview.backgroundColor = RGBA(242, g: 242, b: 242, a: 1)
                
                for view in subview.subviews where view.isKind(of: UIButton.self) {
                    view.backgroundColor = RGBA(242, g: 242, b: 242, a: 1)
                    
                    let deleteBtn = setupDeleteBtn(frame: view.frame)
                    view.addSubview(deleteBtn)
                    view.bringSubviewToFront(deleteBtn)
                }
            }
        }
    }
    
    
    private func setupDeleteBtn(frame: CGRect) -> UIButton {
        
        let deleteBtn = UIButton(type: .custom)
        deleteBtn.frame = frame
        deleteBtn.backgroundColor = RGBA(242, g: 242, b: 242, a: 1)
        deleteBtn.setImage(UIImage(named: "btn_home_footmark_delete"), for: .normal)
        deleteBtn.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        return deleteBtn
    }

}