how to create an enum for a prefab to be instantia

Question

Basically I’ve created a prefab, “badGuy” of which there are three types. Each has it’s their own sprite images. So I created the following enum in a script attached to my badGuy prefab:

public enum BadGuyType {
  green,
  blue,
  red
}

All along I have been using one image for my prefab since I didn’t have a enum. The badGuy game object had a public property for me to add it through the inspector and instantiate it a number of times as below:

public GameObject badGuy; //I set this in the inspector
void Start () {

badGuys= new List<GameObject> ();

int numberOfBadGuys = 6;
Camera camera = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<Camera> ();

for (int i = 1; i < numberOfBadGuys + 1; i++) {
    GameObject badGuyObject =  (GameObject)Instantiate(badGuy, new Vector3(Screen.width*i/2, Screen.height*i/6, camera.nearClipPlane ), Quaternion.identity );
    badGuys.Add(badGuyObject);
}

How can I set images (preferably programmatically) for my BadGuyType enum and select them when instantiating my badGuy game objects?

Answer 1

If you want each badGuy to have its own properties then you need to create a general class for badguys and put all the variables inside it. Create a Script called BadGuysManager then implement all your bad guy's actions inside there or copy the one from below.

Function signatures:

void createBadGuy(GameObject badGuyPrefab, BadGuyType badGuyType, Vector3 badGuyPosition)
void setBadGuyType(BadGuyType badGuyType)
BadGuyType getBadGuyType()
void killBadGuy()
GameObject getBadGuyGameObject()

In your test.cs script, you can add the BadGuysManager script with a list.

public class test : MonoBehaviour
{
    //Attch the gameObject bad guy here
    public GameObject badGuyPrefab;

    List<BadGuysManager> badGuys = new List<BadGuysManager>();

    // Use this for initialization
    void Start()
    {
        /////////////////////////////////////CREATE 3 bad guys with different colors

        //Bad Guy 1, Green Color
        badGuys.Add(gameObject.AddComponent<BadGuysManager>());
        badGuys[0].createBadGuy(badGuyPrefab, BadGuyType.green, Vector3.zero);

        //Bad Guy 2, Blue Color
        badGuys.Add(gameObject.AddComponent<BadGuysManager>());
        badGuys[1].createBadGuy(badGuyPrefab, BadGuyType.blue, Vector3.zero);

        //Bad Guy 3, Red Color
        badGuys.Add(gameObject.AddComponent<BadGuysManager>());
        badGuys[2].createBadGuy(badGuyPrefab, BadGuyType.red, Vector3.zero);

        /////////////////////////////////////CHANGE bad guy type later on
        //badGuys[0].setBadGuyType(BadGuyType.green);

        /////////////////////////////////////READ bad guy type 
        //BadGuyType badGuyType = badGuys[0].getBadGuyType();

        /////////////////////////////////////Get bad guy 
        //GameObject badGuy = badGuys[0].getBadGuyGameObject();

        /////////////////////////////////////KILL bad guy type 
        //badGuys[0].killBadGuy();

    }
}

The code below should be in your BadGuysManager.cs script. This should get you started. You can easily extend or add more functions to the BadGuysManager class.

public class BadGuysManager : MonoBehaviour
{
    private GameObject badGuy; //I set this in the inspector
    private BadGuyType playerGuyType = BadGuyType.NONE;

    public void setBadGuyType(BadGuyType badGuyType)
    {
        playerGuyType = badGuyType;

        if (badGuy == null)
        {
            Debug.Log("Failed to set color because Bad Guy Prefab is null! Call createBadGuy function first");
            return; //exit
        }
        if (badGuyType == BadGuyType.green)
        {
            badGuy.GetComponent<MeshRenderer>().material.color = Color.green;
        }
        else if (badGuyType == BadGuyType.blue)
        {

            badGuy.GetComponent<MeshRenderer>().material.color = Color.blue;
        }
        if (badGuyType == BadGuyType.red)
        {

            badGuy.GetComponent<MeshRenderer>().material.color = Color.red;
        }
    }

    public BadGuyType getBadGuyType()
    {
        return playerGuyType;
    }


    public void createBadGuy(GameObject badGuyPrefab, BadGuyType badGuyType, Vector3 badGuyPosition)
    {
        if (badGuyPrefab == null)
        {
            Debug.Log("Bad Guy Prefab is null!");
            return; //exit
        }

        badGuy = (GameObject)Instantiate(badGuyPrefab, badGuyPosition, Quaternion.identity);
        setBadGuyType(badGuyType);
    }

    public void killBadGuy()
    {
        Destroy(badGuy);
        Destroy(this);
    }

    public GameObject getBadGuyGameObject()
    {
        return badGuy;
    }
}

public enum BadGuyType
{
    NONE,
    green,
    blue,
    red
}