如何修改搜索框中的cancel button的颜色

// 记住最初的状态，用完的时候用这个还原

        self.cancelBtnTextAttribute = UIBarButtonItem.appearance().titleTextAttributes(for: UIControlState.normal) as [String : AnyObject]?

        let cancelBtn:UIButton = self.searchBar.subviews[0].subviews[2] as! UIButton

// 设置自定义的状态

        cancelBtn.setTitle("取消" ,for:UIControlState.normal)

        let cancelButtonAttributes: NSDictionary = [NSForegroundColorAttributeName: UIColor.init(hex6: 0xF24500)]

        UIBarButtonItem.appearance().setTitleTextAttributes(cancelButtonAttributes as? [String : AnyObject], for: UIControlState.normal)

 当然object-c的也是一样的实现，只要把swift的语法转换成object-c的救行了。