UICanvas.lua代码中存在逻辑异常

[zhang00lei]

local function OnCreate(self, relative_order)
	base.OnCreate(self)
	-- Unity侧原生组件
	self.unity_canvas = nil
	self.unity_graphic_raycaster = nil
	
	-- canvas
	self.unity_canvas = UIUtil.FindComponent(self.transform, typeof(CS.UnityEngine.Canvas))
	if IsNull(self.unity_canvas) then
		self.unity_canvas = self.gameObject:AddComponent(typeof(CS.UnityEngine.Canvas))
	end
	self.unity_canvas.overrideSorting = true
	self.unity_canvas.sortingLayerName = SortingLayerNames.UI
	
	-- raycaster
	self.unity_graphic_raycaster = UIUtil.FindComponent(self.transform, typeof(CS.UnityEngine.UI.GraphicRaycaster))
	if IsNull(self.unity_graphic_raycaster) then
		self.unity_graphic_raycaster = self.gameObject:AddComponent(typeof(CS.UnityEngine.UI.GraphicRaycaster))
	end
	
	-- order
	self.relative_order = relative_order or 0
	self:SetOrder(self.relative_order)
end

若self.transform不存在Canvas组件，但是子物体存在Canvas组件，则这条代码self.unity_canvas = UIUtil.FindComponent(self.transform, typeof(CS.UnityEngine.Canvas))获取到的unity_canvas为子物体的Canvas，并未在当前self.transform上添加组件Canvas。GraphicRaycaster组件同理。
不知是否为有意为之。

[zhCNLiang]

是一个bug，获取子节点Canvas没有意义