Unity: How to destroy an Instantiated object in a different function-CodePudding

I'm trying to make a game which is spawning an object and after the object is destroyed, another object spawns right away. But right now I'm trying to destroy an instantiate object in a different function, and it is not working.

    public GameObject[] food;
    public Vector3Int spawnPosition;

    public void Start()
    {
        SpawnFood();
    }

    //Spawning food 
    public void SpawnFood()
    {
        int random = Random.Range(0, food.Length);
        GameObject clone = (GameObject)Instantiate(food[random], this.spawnPosition, Quaternion.identity);
    }

    private void Update()
    {
        if(Input.GetKeyDown(KeyCode.C))
        {
            Destroy(this.gameObject);
        }
    }

I have tried to do some research on this and still, I can only find the solution for destroying an object inside the same function as the Instantiate.

CodePudding user response：

When you call Destroy(this.gameObject), the game object the script attacting to will be destroyed, and after that you cannot call the script.

I guess what you want to destroy is the food game object, not the game object the script you showed here attacting to.

A quick adjustment to suit your need maybe :

...
private GameObject clone
...
private void Update()
{
    if(Input.GetKeyDown(KeyCode.C))
    {
        if (clone != null)
          Destroy(clone);
    }
}

And as @Daniel seggested, if you will repeatedly instantiate/destroy food game object, the better way would be just use the same food object and change it's properties (e.g. location...) to create the new food game object pop-up illusion.

The key idea here is called Object Pooling.

CodePudding user response：

Here is your answer :

declare a public Gameobject:

public GameObject clone;

and replace

GameObject clone = (GameObject)Instantiate(food[random], this.spawnPosition, Quaternion.identity);

with

GameObject clone = Instantiate(food[random], this.spawnPosition, Quaternion.identity);

and then you can destroy in another function or class

public void DestroyFood()
{

Destroy(clone);

//you can instantiate another gameobject here

}