How do I calculate a text size with the Best Fit option using a TextGenerator

Question

My goal is to link several Text components that they all have the same text size. Text size should be the minimum 'best fit' size of all components.

How I try to achieve it is by turning the 'best fit' option off and calculate the size with a custom TextGenerator, copying all TextGenerationSettings from the original Text components.

My Problem is: The calculated Text size is too small. It adjusts according to the RectTransform size, but is just wrong. Any thoughts about this?

Here is the code:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 using UnityEngine.EventSystems;
 
 [ExecuteInEditMode]
 public class kgLinkedBestFit : UIBehaviour 
 {
     public int minTextSize = 5;
     public int maxTextSize = 35;
     public Text[] linkedTexts;
 
     //TEMP: Editor Update
     public void Update()
     {
         TextGenerator textGenerator = new TextGenerator();
         int minimumBestFit = 1000;
 
         foreach(Text t in linkedTexts)
         {
             //get current text generation settings for the text field
             TextGenerationSettings settings = t.GetGenerationSettings(t.rectTransform.rect.size);
 
             //change to best fit settings
             settings.resizeTextForBestFit = true;
             settings.resizeTextMinSize = minTextSize;
             settings.resizeTextMaxSize = maxTextSize;
 
             //calcuclate with text generator
             textGenerator.Populate(t.text,settings);
         
             //set new bestFit if new calculation is smaller than current bestFit
             minimumBestFit = textGenerator.fontSizeUsedForBestFit < minimumBestFit ? textGenerator.fontSizeUsedForBestFit : minimumBestFit;
 
         }
 
         /*at this stage minimumBestFit is calculated too small. When the original textfield is set to best fit, the text size will be 22, the calculated text size is only 12*/
 
         foreach(Text t in linkedTexts)
         {
             //adjust font sizes
             t.fontSize = minimumBestFit;
         }
     }
 }

Answer 1

Answer by hugojacob · Nov 25, 2015 at 09:19 AM

Hey.Old post, but for others i will answer.

I ran into the same problem. When using fontSizeUsedForBestFit variable the size returned did not match in the editor. After a long research the short answer to the problem is to divide the fontsize with the your canvas scale factor like this:

fontsize = fontsize / canvas.scaleFactor;

hope this helps others.

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Anisoropos · Aug 09, 2017 at 09:21 AM 2

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It sure did help!

Here's my full code for getting the current dynamic font size. Place these in a public static class.

             public static int GetCurrentDynamicFontSize(this Text text)
             {
                 if (text == null) return -1;
 
                 float multiplier = 1;
                 Canvas canvas = text.GetHighestCanvas();
                 if (canvas)
                     multiplier = 1 / canvas.scaleFactor;
 
                 return (int)(text.cachedTextGenerator.fontSizeUsedForBestFit * multiplier);
             }
 
             public static Canvas GetHighestCanvas<T>(this T component) where T : Component
             {
                 if (component == null) return null;
                 Canvas[] parentCanvases = component.GetComponentsInParent<Canvas>();
                 if (parentCanvases != null && parentCanvases.Length > 0)
                 {
                     return parentCanvases[parentCanvases.Length - 1];
                 }
                 return null;
             }

Answer 2

In case anyone else wants it, you have to wait a frame so the fontSizeUsedForBestFit gets calculated. I get consistant size of an item by adding anything I want to an array in the inspector and on play, wait a frame, find the size and apply it:

 using UnityEngine.UI;
 
 /// <summary>
 /// Cant work in editor, but will when the play button is pressed
 /// </summary>
 public class ConsistantTextSize : MonoBehaviour {
     public Text[] m_TextList;
     private int m_Size = 1;
 
     // Use this for initialization
     void Start () {
         SetSizes();
     }
 
     public void SetSizes()
     {
         foreach (var item in m_TextList)
             item.resizeTextMaxSize = 1000;
 
         StartCoroutine(WaitFrame());
     }
 
     public IEnumerator WaitFrame()
     {
         // returning 0 will make it wait 1 frame
         // need to wait a frame in order for the layout to work out the size
         yield return 0;
         ApplySizes();
     }
 
     public void ApplySizes()
     { 
         // Get the first one
         if (m_TextList.Length > 0)
             m_Size = m_TextList[0].cachedTextGenerator.fontSizeUsedForBestFit;
 
         // See if any are smaller
         foreach (var item in m_TextList)
         {
             if (item.cachedTextGenerator.fontSizeUsedForBestFit < m_Size)
                 m_Size = item.cachedTextGenerator.fontSizeUsedForBestFit;
         }
 
         // Apply as max size to all of the images
         foreach (var item in m_TextList)
             item.resizeTextMaxSize = m_Size;
     }
 }

How do I calculate a text size with the Best Fit option using a TextGenerator

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