How to make text within couroutine fade?

I would like to have the text fade away. How would one implement that into this script?


using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

[ExecuteInEditMode]
public class TurnBack : MonoBehaviour {

[Space(10)]
[Header("Toggle for the gui on off")]
public bool GuiOn;


[Space(10)]
[Header("The text to Display on Trigger")]
[Tooltip("To edit the look of the text Go to Assets > Create > GUIskin. Add the new Guiskin to the Custom Skin proptery. If you select the GUIskin in your project tab you can now adjust the Label section to change this text")]
public string Text = "Turn Back";

[Tooltip("This is the window Box's size. It will be mid screen. Add or reduce the X and Y to move the box in Pixels. ")]
public Rect BoxSize = new Rect( 0, 0, 200, 100);


[Space(10)]
[Tooltip("To edit the look of the text Go to Assets > Create > GUIskin. Add the new Guiskin to the Custom Skin proptery. If you select the GUIskin in your project tab you can now adjust the font, colour, size etc of the text")]
public GUISkin customSkin;



// if this script is on an object with a collider display the Gui
void OnTriggerEnter()
{
GuiOn = true;
StartCoroutine("MyCoroutineName");
}


IEnumerator MyCoroutineName()
{
yield return new WaitForSeconds(3);
GuiOn = false;
}

void OnGUI()
{

if (customSkin != null)
{
GUI.skin = customSkin;
}

if (GuiOn == true)
{
// Make a group on the center of the screen
GUI.BeginGroup (new Rect ((Screen.width - BoxSize.width) / 2, (Screen.height - BoxSize.height) / 2, BoxSize.width, BoxSize.height));
// All rectangles are now adjusted to the group. (0,0) is the topleft corner of the group.

GUI.Label(BoxSize, Text);

// End the group we started above. This is very important to remember!
GUI.EndGroup ();

}


}

}

 

Please edit your post, add code-tags and properly format your code (such as proper indent levels, etc):
https://forum.unity.com/threads/using-code-tags-properly.134625/

It will make it easier for everybody to read and increases chances that someone will actually look at it.

 

I'd like to add that it might be a good idea to remove extra "fluff" from the code like Tooltips etc. that really aren't essential for a question, they just add more lines that are really not important.