Exiting a coroutine

Unity Engine
1

Hello,

I am running a coroutine and I want it to exit early if an error happens. However it doesn’t seem to work… Here is an example:

void Start()
{
      StartCoroutine( Foo() );
}

IEnumerator Foo()
{
    // do something
    yield return new WaitForSeconds( 1 );

   // do something else
   yield return new WaitForSeconds( 1 );

   if( errorHappened )
   {
         yield return 0;
   }

   // error has not happened so move on
   ...
   // do something else
   yield return new WaitForSeconds( 1 );

   // done
   yield return 0;
}

In this example when errorHappened is true the coroutine will yield and then continue its execution as if nothing happened…

Does this mean that the only way to exit a coroutine early is to call StopCoroutine ?

Thank you

1 Like
2

You can use

yield break;

to exit a coroutine.

55 Likes
3

oh that’s right :S

Thanks!

4

“yield return 0” means “wait a frame”, basically the same as yield return null, but slightly less efficient. You can just do “return”.

–Eric

5

My coroutine wouldn’t let me simply “return”. “yield break” worked though. Is “return” on it’s own really possible?

1 Like
6

If you use Unityscript, yes.

–Eric

7

If my coroutine doen’t finish any “yield…” - is it error?

8

Hi thanks, 2020 and this is still the working solution.
Had me confused why return; was not allowed.

11 Likes