Mike Ottink Mike Ottink - 1 year ago 211
C# Question

Unity 3D - Pass a monobehaviour inside a non monobehaviour class

How can you pass a Monobehaviour inside an instance of a non Monobehaviour class? I found this link https://forum.unity3d.com/threads/running-startcoroutine-from-a-non-monobehaviour.233817/ where TonyLi mentions that you can pass a Monobehaviour to start and stop coroutines inside a instance of a class, but he does not show how you can do that. He does this theEvent.StartEvent(myMonoBehaviour); but he does not show where he gets myMonobehaviour from. I looked around on the internet but I cannot seem to find how.

  • Edit

Here is what I am trying to do. I want to run a coroutine inside an instance of a class. I also want to be able to stop the coroutine inside the instance of the class. I want to do it this way so that I don't have any objects in my scene that have large managers and also so that I can reuse the code for any object that I want to pingpong in this way. The code moves a Gameobject in one direction then takes a break and moves it in the other direction and takes a break again etc. But I cannot start the coroutine from outside the class.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

[RequireComponent (typeof(Image))]
public class SpecialBar : MonoBehaviour {

public float rangeX;
public float breakTime;
public float step;
float startProgress = 0.5f;
PingPongGameObject pingPonger;

Color[] teamColors = new Color[]{new Color(255,136,0),new Color(0,170,255)};

void Start()

for(int i = 0; i < teamColors.Length; ++i)
teamColors[i] = StaticFunctions.NormalizeColor (teamColors[i]);

pingPonger = new PingPongGameObject (gameObject.transform.position,
new Vector3(rangeX,0.0f,0.0f),

The second class is where my coroutine is in.

public class PingPongGameObject
float step;
Vector3 center;
Vector3 range;
GameObject ball;
float progress;
float breakTime;
Vector3 endPos;
Vector3 oppositePosition;

public PingPongGameObject(Vector3 _center, Vector3 _range, GameObject _ball, float _startProgress, float _breakTime, float _step)
center = _center;
range = _range;
ball = _ball;
progress = _startProgress;
breakTime = _breakTime;
step = _step;
endPos = center - range;
oppositePosition = center + range;
// This is where I want to start the coroutine

public IEnumerator PingPong()

while (progress < 1) {
progress += Time.deltaTime * step;
Vector3 newPos = Vector3.Lerp (oppositePosition, endPos, progress);
ball.transform.position = newPos;
yield return null;
Vector3 temp = endPos;
endPos = oppositePosition;
oppositePosition = temp;
progress = 0;
yield return new WaitForSeconds (breakTime);
yield return null;

public float Step
set{step = value;}

public void StopCoroutine()
// This is where I want to stop the coroutine

Answer Source

TonyLi mentions that you can pass a Monobehaviour to start and stop coroutines inside a instance of a class, but he does not show how you can do that. He does this

You are can do that with the this keyword. The this keyword will get the current instance of MonoBehaviour.

In this example there's a tree, which happens to have a component MonoScript:

enter image description here

That particular instance of MonoScript can if it wants (since it's a c# program) instantiate a general c# class, NonMonoScript:

Class to pass MonoBehaviour from:

public class MonoScript : MonoBehaviour
    void Start()
        NonMonoScript  nonMonoScript = new NonMonoScript();
        //Pass MonoBehaviour to non MonoBehaviour class

Class that receives pass MonoBehaviour instance:

public class NonMonoScript 
    public void monoParser(MonoBehaviour mono)
        //We can now use StartCoroutine from MonoBehaviour in a non MonoBehaviour script

       //And also use StopCoroutine function

    IEnumerator testFunction()
        yield return new WaitForSeconds(3f);

You can also store the mono reference from the monoParser function in a local variable to be re-used.

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