判断UI元素超出屏幕

这里只判断UI元素的RectTransform，不判断实际UI元素实际绘制区域，代码如下

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local halfW = 121
local halfH = 50
function GuideDesPosView:CalcUiBound()
  if not self.m_desPos then
    return
  end

  local value = Camera.main:WorldToScreenPoint(self.m_desPos)
  local x = value.x
  local y = value.y
  local z = value.z
  if x == self.m_lastX and y == self.m_lastY and z == self.m_lastZ then
    return
  end

  if z < 0 then
    if self.contentTrans.gameObject.activeSelf then
      self.contentTrans.gameObject:SetActive(false)
    end
    return
  elseif z >= 0 then
    if self.m_lastZ >= 0 then
      self.contentTrans.gameObject:SetActive(true)
    end
  end

  local scaleX = 1920 / Screen.width
  local scaleY = 1080 / Screen.height

  self.m_lastX = x
  self.m_lastY = y
  self.m_lastZ = z
  if (value.x + halfW > Screen.width) then
    x = Screen.width - halfW
  end

  if (value.x - halfW < 0) then
    x = halfW
  end

  if (value.y - halfH < 0) then
    y = halfH
  end

  if (value.y + halfH > Screen.height) then
    y = Screen.height - halfH
  end

  self.contentRectTrans.localPosition = Vector3((x - Screen.width / 2) * scaleX, (y - Screen.height / 2) * scaleY, 0)
end