Text letter by letter in GO - unity3d

Question

I'm doing an unity game and I'd like to show text in a panel letter by letter (like if someone was typing).
I've already looked a few things (coroutines,IEnumerator) but didn't figure out how to do it.
My GO is a prefab that I instantiate.I don't instantiate in Scene window, all the instantiations are done in the code. And it't not a MonoBehaviour class.
This is the prefab I instantiate :
InteractionIntro = Instantiate(Resources.Load("Prefab/Play/Interaction") as GameObject);
InteractionIntro.transform.SetParent(canvasGameObject.transform, false);
InteractionIntro.transform.localPosition = new Vector3(0, 200, 0);
public void SetInteractionText(string text)
{
InteractionIntro.GetComponentInChildren<Text>().text = text;
}
The hierarchy looks like this :
So I'd like that the "Text" component has a letter-by-letter effect.
Any idea on how to solve this ?
#UPDATE : maybe adding a script to my prefab ?
#UPDATE : i read the text that's displayed from a file.
#EDIT : so i've created a script. Here's my code:
public class TypingEffect : MonoBehaviour
{
public GameObject GO;
public float delay = 0.1f;
public string fullText;
private string currentText = "";
// Use this for initialization
void Start () {
StartCoroutine(ShowText());
}
IEnumerator ShowText(){
for(int i = 0; i <= fullText.Length; i++){
currentText = fullText.Substring(0,i);
GO.GetComponent<Text>().text = currentText;
yield return new WaitForSeconds(delay);
}
}
}
It works. Text is displayed letter by letter. But its a text I wrote on inspector:
How do I link text to the setInteractionText method ?
#UPDATE : managed to do it, but it only writes letter-by-letter first text, if I display second text it does not work anymore. maybe reset ?

Answer 1

I solved it using a separate script.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class TypingEffect : MonoBehaviour
{
public GameObject GO;
public float delay = 0.05f;
private string fullText;
private string currentText = "";
// Use this for initialization
void Start () {
StartCoroutine(ShowText());
}
void Update()
{
}
IEnumerator ShowText()
{
currentText="";
for(int i = 0; i <= fullText.Length; i++){
currentText = fullText.Substring(0,i);
GO.GetComponent<Text>().text = currentText;
yield return new WaitForSeconds(delay);
}
}
public void setText(string text)
{
this.fullText = text;
StartCoroutine(ShowText());
}
}
The method setText is called in another class every time I need to set another text. It's important to not forget to call StartCoroutine again.