Xtykutl

using UnityEngine;
using UnityEngine.UI;

public class slide : MonoBehaviour {

Text text;

public Slider slider;



void Start(){



    text = GetComponent<Text> ();



}



public void textscale(int value){



    slider.value     = text.fontSize;



}





}

1. 
   

   Replace your current script with the following one:

   
   
   

   public class slide : MonoBehaviour
   
   {
   
       public Text text; // Drag & drop the Text component inside the Inspector
   
   
   
       public void ChangeFontSize(float value)
   
       {    
   
           ChangeFontSize( Mathf.RoundToInt( value ) ) ;
   
       }
   
   
   
       public void ChangeFontSize(int value)
   
       {    
   
           text.fontSize = value;    
   
       }
   
   }
   
   

   
   



2. Click on your Slider, add a new entry in the OnValueChanged event.



3. Drag & drop the gameObject holding the script, and select slide > ChangeFontSize (Dynamic float)
   

1. 
   

   Add script:

   
   
   

   using UnityEngine;
   
   using UnityEngine.UI;
   
   
   
   public class ScalerScript : MonoBehaviour
   
   {
   
       public Text text;
   
   
   
       public void TextScale(Slider slider)
   
       {
   
           text.fontSize = (int)slider.value;
   
       }
   
   }
   
   

   
   



2. Create empty GameObject. Attach ScalerScript to it and drag and drop your Text object to Text field of the script in the Inspector window:

3. Set Vertical Overflow to Overflow for your Text element:
   




4. Set up Slider. Drag and drop empty GameObject with ScalerScript attached to OnValueChanged slider function. Drag and drop Slider element as a parameter to TextScale method. Set Slider's MaxValue to 200:

5. Run the scene.