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31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
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# Coroutines
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[Coroutines - Unity manual](https://docs.unity3d.com/Manual/Coroutines.html)
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When you call a function, it runs to completion before returning. This effectively means that any action taking place in a function must happen *within a single frame update*; a function call can’t be used to contain a procedural animation or a sequence of events over time.
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A coroutine is like a function that has the ability to pause execution and return control to Unity but then to continue where it left off on the following frame.
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It is essentially a function declared with a return type of IEnumerator and with the yield return statement included somewhere in the body. The `yield return null` line is the point at which execution will pause and be resumed the following frame.
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```cs
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//coroutine
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IEnumerator coroutine()
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{
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// action performed
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yield return null; // pause until next iteration
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// or
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// By default, a coroutine is resumed on the frame after it yields but it is also possible to introduce a time delay
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yield return new WaitForSeconds(seconds); // wait seconds before resuming
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// or
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yeld return StartCoroutine(coroutine()); // wait for anothe coroitine to finish before starting
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}
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StartCoroutine(coroutine()); // start the coroutine
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StopCoroutine(coroutine()); // stop the coroutine
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```
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