Swift3 TextViewにToolBarを追加する方法

    func keyboardToolbar(textView: UITextView) {
        
        let toolbar: UIToolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: 1, height: 1))
        toolbar.barStyle = UIBarStyle.default
        toolbar.bounds.size.height = 28
        
        let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        

        let done: UIBarButtonItem = UIBarButtonItem(title: "done", style: UIBarButtonItemStyle.done, target: self, action: #selector(self.doneButtonActionn))
        done.tintColor = UIColor.red
        
        let clear: UIBarButtonItem = UIBarButtonItem(title: "Clear", style: UIBarButtonItemStyle.plain, target: self, action: #selector(self.doneButtonAction))
        clear.tintColor = UIColor.black
        
  
        var items = [UIBarButtonItem]()
        
        items.append(clear)
        items.append(flexSpace)
  
        items.append(done)
        
        toolbar.items = items
        toolbar.sizeToFit()
        
        textView.inputAccessoryView = toolbar
    
    
    }
    
    
    func doneButtonAction() {
        
        self.bodyTextView.resignFirstResponder()
        //self.bottomSpace.constant = 12
    }
    
    func doneButtonActionn() {
        
        self.bodyTextView.resignFirstResponder()
        //self.bottomSpace.constant = 12
    }

    func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
        
        self.keyboardToolbar(textView: textView)
        return true
    }