Coroutine stops working after first run

Questions & Answers
1

Premise:

I’ve got a button (made of a quad) working properly that references an animation curve to animate when clicked.

Issue

I can click my button once, and it’ll run through the coroutine that uses the animation curve to animate it. But after that, I can’t get it to trigger again. I know its still receiving the click events from the log, but the coroutine won’t run after the first time its run. Any ideas why? Code for the button script below:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Button : MonoBehaviour {


	public AnimationCurve curveAnim;
	public float posDisplacement;
	public float speed;

	public void KickBack(){
		StartCoroutine (kickback());
	}

	IEnumerator kickback(){  //animation coroutine
		float curveTime = 0f;
		float curveAmount = curveAnim.Evaluate (curveTime);

		while (curveAmount < 1.0f) {
			curveTime += Time.deltaTime * speed;
			curveAmount = curveAnim.Evaluate (curveTime);
			transform.position = new Vector3 (transform.position.x, transform.position.y, curveAmount*posDisplacement);
			yield return null;
		}
	}

	//Button events called from "gameObject.SendMessage." in another script
	void OnTouchDown(){
		Debug.Log ("Touch Down!");
	}

	void OnTouchUp(){
		Debug.Log ("Touch Up!");
		KickBack ();
	}

	void OnTouchStay(){
		
	}

	void OnTouchExit(){

	}
}
2

It’s just a guess because the code looks mostly fine, but I think your first Coroutine never stops and happens to be executed after all following Coroutine calls forever after.

The coroutine ends when

curveAmount < 1.0f

is the case, and depending on how you set your AnimationCurve, this might be true forever.

I suppose you initially wanted to check

curveTime < 1.0f

anyway, which would be reliable to go over 1 sooner or later (unless speed is less than or equal to 0).