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Showing content from https://docs.unity3d.com/Manual/../ScriptReference/MonoBehaviour.StopCoroutine.html below:

Unity - Scripting API: MonoBehaviour.StopCoroutine

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public void

(

);

Stops the first coroutine named methodName, or the coroutine stored in routine running on this behaviour.

StopCoroutine takes one of three arguments which specify which coroutine is stopped:

• A string function naming the active coroutine
• The IEnumerator variable used earlier to create the coroutine.
• The Coroutine to stop the manually created Coroutine.

Note: Do not mix the three arguments. If a string is used as the argument in StartCoroutine, use the string in StopCoroutine. Similarly, use the IEnumerator in both StartCoroutine and StopCoroutine. Finally, use StopCoroutine with the Coroutine used for creation.

In the CS example, the IEnumerator type is used.

using UnityEngine;
using System.Collections;
public class Example : MonoBehaviour
{
    // keep a copy of the executing script
    private IEnumerator coroutine;
    // Use this for initialization
    void Start()
    {
        print("Starting " + Time.time);
        coroutine = WaitAndPrint(3.0f);
        StartCoroutine(coroutine);
        print("Done " + Time.time);
    }
    // print to the console every 3 seconds.
    // yield is causing WaitAndPrint to pause every 3 seconds
    public IEnumerator WaitAndPrint(float waitTime)
    {
        while (true)
        {
            yield return new WaitForSeconds(waitTime);
            print("WaitAndPrint " + Time.time);
        }
    }
    void Update()
    {
        if (Input.GetKeyDown("space"))
        {
            StopCoroutine(coroutine);
            print("Stopped " + Time.time);
        }
    }
}

The following cs example shows how StopCoroutine(Coroutine) can be used.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ExampleClass : MonoBehaviour
{
    void Start()
    {
        StartCoroutine(coroutineA());
    }
    IEnumerator coroutineA()
    {
        // wait for 1 second
        yield return new WaitForSeconds(1.0f);
        Debug.Log("coroutineA() started: " + Time.time);
        // wait for another 1 second and then create b
        yield return new WaitForSeconds(1.0f);
        Coroutine b = StartCoroutine(coroutineB());
        yield return new WaitForSeconds(2.0f);
        Debug.Log("coroutineA() finished " + Time.time);
        // B() was expected to run for 10 seconds
        // but was shut down here after 3.0f
        StopCoroutine(b);
        yield return null;
    }
    IEnumerator coroutineB()
    {
        float f = 0.0f;
        float start = Time.time;
        Debug.Log("coroutineB() started " + start);
        while (f < 10.0f)
        {
            Debug.Log("coroutineB(): " + f);
            yield return new WaitForSeconds(1.0f);
            f = f + 1.0f;
        }
        // Intended to handling exit of the this coroutine.
        // However coroutineA() shuts coroutineB() down. This
        // means the following lines are not called.
        float t = Time.time - start;
        Debug.Log("coroutineB() finished " + t);
        yield return null;
    }
}

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