求助！按钮按下回弹问题

Cocos2d-x Lua
#1

local UIButton = require(“framework.cc.ui.UIButton”)

UIButtonEx = {}

function UIButtonEx.extend(btn)
print("=======>>>>>> 进入")
function btn:setPressedActionEnabled(enabled)
print("=======>>>>>> 接收 enabled")
if enabled then
self.onPressed = function()
self:setScale(0.9) --1.1
print("=======>>>>>> 缩放测试111")
end

  self.onRelease = function()
    self:setScale(1.0)
    print("=======>>>>>> 缩放测试222")
  end
  self:onButtonPressed(self.onPressed)
  self:onButtonRelease(self.onRelease)
else
  if self.onPressed then
    self:removeEventListenersByEvent(UIButton.PRESSED_EVENT)
    self.onPressed = nil
  end
  if self.onRelease then
    self:removeEventListenersByEvent(UIButton.RELEASE_EVENT)
    self.onRelease = nil
  end

end

end
end

#2

这段代码是在网上看到的！不知道怎么用？求大神指导？
我把我的button传入进去后，只进了 print("=======>>>>>> 进入") 这个输出，后面的没有进， 参数enabled打印为nil.
求大神指导？？