Draw Calls are based on the number of atlases and dynamic font materials used in your scene.
If you click on your root - UIPanel, it shows you stats for the number of draw calls you are using.
In my example, I am using 1 atlas of sprites, 3 dynamic font materials, so my draw calls say:
Draw Calls 4
If I have any other UIPanels in children nodes, notice how they show Draw Call 0.
that's because the first time all children nodes add into UIPanel - 2D UI,and than add a new panel at one child,this wont add again.so that new uipanel drallcall 0.
i wanna test is UIPanel.LateUpdate function,you know each child changed,will Refresh all of those,will spend a lot of performance....
1、if i make the struct like this(child are the same.)
root(uipanel-0drallcall)MainObject
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
-child(uipanel-1drallcall)
2、only 1 uipanel at root.
root(uipanel-1drallcall)MainObject
-child
-child
-child
-child
-child
-child
-child
