swift3.0 挖出tablecell 自带选中

override func layoutSubviews() {
        
        for item in self.subviews {
            
            if item.isMember(of: NSClassFromString("UITableViewCellEditControl")!) {
                
                let control : UIControl = item as! UIControl
                for view in control.subviews {
                    
                    if view.isKind(of: UIImageView.self) {
                        
                        let img : UIImageView = view as! UIImageView
                        img.snp.makeConstraints({ (make) in
                            make.centerY.equalTo((self.goodsImage?.snp.centerY)!)
                            make.left.equalTo(8)
                        })
                        if self.isSelected {
                            img.image = UIImage.init(named: "check_icon")
                        }
                        else{
                            img.image = UIImage.init(named: "uncheck_icon")
                        }
                    }
                }
            }
        }
        
        super.layoutSubviews()
    }