         let complete = TabNavigationItem(title: "完成", target: self, selector: #selector(_handleCompleteAction(_:)))
         setTabNavigationItems([complete, cancel])
         
-        _setupBackToTopButton()
         // Load data of table view.
         tableView.reloadData()
     }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}


        
        return (lightColor, darkColor)
    }
}

// MARK: - Storyboard Supporting.
