Yield WaitForSeconds doesn't work!

Question

I've got this code here and want it to wait 3 sec, before the check boolean gets reversed, but I'm unable to make this happen, since I've obviously put a mistake in my code which I don't find.

My aim is, to make the text fade out and then in again, endlessly.

 using UnityEngine;
 using System.Collections;
 
 public class BlinkingText : MonoBehaviour {
 
     float duration = 3;
     public GUIText guiText;
     public bool check = false;
 
     void Update () {
         if (check == false) {
             Color myColor = guiText.color;
             float ratio = Time.time / duration;
             myColor.a = Mathf.Lerp (1, 0, ratio);
             guiText.color = myColor;
            Pause ();
             check = !check;
         }
         else if (check == true) {
             Color myColor = guiText.color;
             float ratio = Time.time / duration;
             myColor.a = Mathf.Lerp (0, 1, ratio);
             guiText.color = myColor;
             check = !check;
         }
         
     }
 
     IEnumerator Pause() {
         yield return new WaitForSeconds(3);
     }
 }

Please help!

Answer 1

Best Answer

Answer by Mikilo · Sep 01, 2015 at 03:54 PM

Hello.

Calling Pause() in Update wont make it run correctly.

Since it is a coroutine, you need to call it through StartCoroutine().

My advice would be to put all your code in a coroutine and call it in Start().

Like that:

     float duration = 3;
     public GUIText guiText;
     public bool check = false;

     void Start()
     {
         StartCoroutine(this.Fade());
     }

     IEnumerator Fade()
     {
         float timeLeft = duration;
         float timePassed = 0F;

         while (true)
         {
             myColor.a = Mathf.PingPong(timePassed, 1F);
             guiText.color = myColor;

             timeLeft -= Time.deltaTime;
             timePassed += Time.deltaTime;

             if (timeLeft < 0F)
             {
                 timeLeft = duration;
                 yield return new WaitForSeconds(duration);
             }
             else
                 yield return null;
         }
     }

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Jan182 · Sep 01, 2015 at 04:14 PM 0

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thank you very much, it works fine to 99%! :D

the 1% problem is that it doesn't fade anymore, the text gets just appears and disappears...

any ideas?

Jan182 · Sep 01, 2015 at 04:27 PM 0

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sorry, but it still doesn't work :(

Mikilo · Sep 01, 2015 at 04:47 PM 1

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Ok I think I know what you want exactly. XD

Jan182 · Sep 01, 2015 at 05:06 PM 1

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I just had to add

 Color myColor = guiText.color;

in line 16, but hell yeah that's it then! :D

thank you so much!!

Yield WaitForSeconds doesn't work!

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