How to write a custom WaitUntil that is reusable?

Question

In my turn based game, I like to have a function similar to Unity's WaitForSeconds, WaitUntil that can be called within a IEnumerator that suspends the coroutine execution for the given amount of moves. I already have a public working UnityEvent (moveEvent) which I could listen to.

So I could call it from any IEnumerator like:

IEnumerator Example() { yield return new WaitForMoves(2); }

I think I'd need a separate class like:

class WaitForMoves { int moves = 0; void Start() { Game.moveEvent.AddListener(OnMoveComplete); } void OnMoveComplete() { moves++; } // I'm not sure how to write this in a way that it waits // until this.moves === movesToWait public WaitForMoves(int movesToWait) { } }

Ed Marty · Accepted Answer · 2019-03-08 13:46:44Z

https://docs.unity3d.com/ScriptReference/CustomYieldInstruction.html

class WaitForMoves : CustomYieldInstruction { private int movesLeft; public WaitForMoves(int moves) { movesLeft = moves; Game.moveEvent.AddListener(OnMoveComplete); } void OnMoveComplete() { movesLeft—-; if (movesLeft <= 0) Game.moveEvent.RemoveListener(OnMoveComplete); } public override bool keepWaiting { get { return movesLeft > 0; } } }

And to use it, just as you wanted:

yield return new WaitForMoves(2);

If you have a global move counter in Game, then you wouldn’t need to have a listener at all:

class WaitForMoves : CustomYieldInstruction { private int targetMoves; public WaitForMoves(int moves) { targetMoves = moves + Game.moveCounter; } public override bool keepWaiting { get { return Game.moveCounter < targetMoves; } } }

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