Problems determining RectTransform's height

Hello everybody!

I've got a problem determining the height of a needed RectTransform at runtime.

I have a quite complicated UI driven by numerous LayoutElements and Layout Vertical (and Horizontal) groups. The problem is that GetComponent<RectTransform>().rect on a nested element inside this UI returns quite strange rects: some only have non-zero width (while zero height), some have only zero values (x, y, width and height). I suppose this is because outer Layout Group, which drives this element, somehow disturbes the rect.

So the question is: how to determine actual size of a RectTransform, which is driven by LayoutElement or Layout Group?

Thanks.

P.S. Also there is a Content Size Fitter attached to the top panel which holds other UI elements.

 

I have the same issue, cant seem to find a solution if anyone can help. The same prefab works in its own scene, but when put in a complex one elements say they are 0 height/ 0 width when they are not

 

Meanwhile I got a workaround for this for static elements, which do not change their size during runtime.
I'll give an example of height.
First, I wrote down the height of the needed element in the inspector in the scene, let it be 48.
Then, when initializing the scene I get the vertical "scale factor" of main canvas:

Code (CSharp):

1. var canvas = GameObject.Find ("Canvas");
2. _scaleFactorY = canvas.GetComponent<RectTransform> ().localScale.y;
3.  

Later actual height of the element could be calculated by multiplying those two values:

Code (CSharp):

1. 48 * _scaleFactorY

For width everything is the same except you should take localScale.x of Canvas' RectTransform.

Hope this will help you

 

Hi, it's because the auto layout is not calculated until the end of the frame (presumably on LateUpdate ?). Take a look at the bottom of this page:
http://docs.unity3d.com/Manual/UIAutoLayout.html

Use the OnRectTransformDimensionsChange method and you'll get the correct rect.width and rect.height values.