Coroutine help? Strange issue

Unity Engine
1

Hi!

I have this code that i am using for fading out gui panels (made with NGUI), the problem is that code in update works just fine but when i want to do it through coroutine it just executes once?

here is the code (i comment out StartCoroutine part and comment Update to execute through coroutine)

using UnityEngine;
using System.Collections;

public class UnfadePanel : MonoBehaviour
{
    
	public float duration = 1.5f;
	
	float mStart = 0f;
	UIWidget[] mWidgets;
 
    void Start ()
    {
		mWidgets = GetComponentsInChildren<UIWidget>();
	
		foreach (UIWidget w in mWidgets)
		{
			Color c = w.color;
			c.a = 0f;
			w.color = c;
		}
		
		//StartCoroutine(Unfade());
		
    }
	
	IEnumerator Unfade()
	{
		mStart += Time.deltaTime * (1f / duration); 
		Debug.Log(mStart.ToString());
		
		float alpha = Mathf.Lerp(0f,1f,mStart);
		
		foreach (UIWidget w in mWidgets)
		{
			Color c = w.color;
			c.a = alpha;
			w.color = c;
	    }
		if(alpha == 1.0)
			Destroy(this);
		yield return null;
	}
 
	
    void Update ()
    {
		mStart += Time.deltaTime * ( 1 / duration ); 
					
		float alpha = Mathf.Lerp(0f,1f,mStart);
				
		foreach (UIWidget w in mWidgets)
	    {
	    	Color c = w.color;
	    	c.a = alpha;
			w.color = c;
		}
	        
		if(alpha == 1.0f)
			Destroy(this);
	}
	
}

any help appreciated!

2

You need a loop in the coroutine. Your coroutine will execute, then wait for a frame and exit in the next. Putting everything in a while(true) block should do the trick.