Universal Method of finding pixel dimensions of UI elements

Question

Assuming we're considering UI elements nested under a screen-space overlay canvas. Is there a universal method of getting the exact dimensions of an element E in pixels?

Please consider all the possible cases:

All possible anchor settings
All possible pivot settings
Elements that are c$$anonymous$$ldren of a
layout group
Elements that contain content size
fitters
The Canvas has different UI scale modes

I've tried all the built in methods/variables with RectTransform and none of them seem to work for all cases. Is there an easy method to get the pixel dimensions?

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Answer by nabrown3 · Sep 30, 2015 at 06:08 PM

Ok, so the real cause of my inability to do t$$anonymous$$s correctly came from the fact that UI elements with content size fitters need 1 frame to update after c$$anonymous$$ldren are added to them before you can accurately get their sizes. Knowing t$$anonymous$$s, you can just use RectTransform.rect to get accurate coordinates (assuming you do so one frame after adding anyt$$anonymous$$ng to the element).

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simonrcodrington · Sep 16, 2020 at 01:37 AM 0

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Wanted to add on here in case anyone comes across this thread. This worked perfectly for me.

My item had 0 width and size on load and was using a content size fitter to make it dynamic, I had no idea why it had no size. I ran a coroutine a frame after my item is initialised and was able to get the pixel coordinates after it adjusted.

Cheers for the answer.

IggyZuk · Sep 16, 2020 at 01:57 AM 1

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You don't have to wait. You can force it with: Canvas.ForceUpdateCanvases(); or LayoutRebuilder.ForceRebuildLayoutImmediate((RectTransform)transform);

Universal Method of finding pixel dimensions of UI elements

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