更改UITableView左边编辑图片

在UITableViewCell中实现

 //修改编辑的图片
        override func layoutSubviews() {
            super.layoutSubviews()
            for control in self.subviews{
                if control.isMemberOfClass(NSClassFromString("UITableViewCellEditControl")!){
                    for v in control.subviews{
                        if(v.isKindOfClass(UIImageView)){
                            let img = v as! UIImageView
                            if(self.selected){
                                img.image = UIImage(named: "fszc_mainmap_dianzhuang.png")
                            }else{
                                img.image = UIImage(named: "fszc_daohangimage.png")
                            }
                        }
                    }
                }
            }
        }