Getting the width of UI text inside a layout allways 0.

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Hello, I simply want to get the width of an element inside a horizontal layout at runtime. Currently I always get 0.0, using RectTransform.rect or RectTransform.sizeDelta. The width is definitely not 0.

Any ideas what the problem is? Or how to bypass it to find out the width?

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Answer by DiegoSLTS · Jun 07, 2015 at 01:05 AM

I just tested this and I guess you're getting the size on the Awake or Start method, but you have to wait one frame before getting the correct sizeDelta or rect of the elements. I guess the reason for this is that the HorizontalLayoutGroup component adjusts the sizes on the first frame after all the Start methods have been called.

Instead of the common "void Start()" method, use "IEnumerator Start()" method. It'll work just like the first one, but it's now a coroutine so you can yield for one frame. So, instead of this:

 void Start() {
     Debug.Log(GetComponent<RectTransform>().rect.width);
 }

which prints "0", use this:

 IEnumerator Start() {
     yield return null;
     Debug.Log(GetComponent<RectTransform>().rect.width);
 }

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Socapex · Jun 07, 2015 at 06:21 AM 0

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Awesome! I ended up extracting my objects in a different empty, which ended up working. But your answer is very clear and clever :) I thought it may have been the Start(), but I wasn't aware of a way to call anything right after Start. This will definitely come in useful in other situations, thank you!

dappledore · Aug 26, 2016 at 05:50 AM 0

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genius answer

Kadjai · Jun 10, 2020 at 08:22 PM 0

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It works. $$anonymous$$y first 4 times finding width worked fine without this, but the 5th... nah. But they all work with the IEnumerator adjustment.

Getting the width of UI text inside a layout allways 0.

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