How to control one of multiple instances of a prefab? - unity3d

Question

My "game" read a file XML, identify some elements and instance him at runtime. This instances is of a prefab.
So, I have a loop with a variable "ins" that create the instances:
ins = (GameObject)Instantiate (this.MyPrefab, position, Quaternion.identity);
I would like, for example, to click on a instance and change its color and not on all instances.

Answer 1

The problem in your code is thatUpdate() calls Click() in every frame. So, whenever you press the mouse button if( Input.GetMouseButtonDown(0) ) becomes true for every prefab and they all process the click event, irrespective of whether they were clicked on or not.
The solution would be to add a Collider component to your prefab and implement OnMouseDown() in ButtonDiagram class to detect mouse clicks on the object. Something like :
public class ButtonDiagram : MonoBehaviour
{
// rest of your code
void OnMouseDown()
{
Debug.Log("Click!");
}
}
Unity's documentation:
http://docs.unity3d.com/ScriptReference/MonoBehaviour.OnMouseDown.html

Answer 2

You could do an array of gameobjects.
Do a foreach loop and add each instance to the your array. Then you could do ins[0].DOSOMETHING or, simpler, have the prefabs you're instantiating have a script on it then accepts mouse clicks or other input and that will affect only the gameobject/prefab that the user interacts with.

Answer 3

using UnityEngine;
using System.Collections;
public class Program : MonoBehaviour
{
private Diagram diagram { get; set; }
public string arquivoXMI;
public GameObject ButtonDiagramGameObject;
private const int SPACEX = 2;
private GameObject ins;
public ArrayList instances{ get; private set; }
// Use this for initialization
void Start ()
{
this.diagram = new Diagram (arquivoXMI);
ButtonForEachSequenceDiagram ();
}
//BUTTON FOR EACH SEQUENCE DIAGRAM
private void ButtonForEachSequenceDiagram()
{
instances = new ArrayList ();
if (this.diagram.SequenceDiagrams.Count > 0) {
float increment = (this.ButtonDiagramGameObject.transform.localScale.x / 2) + SPACEX;
float position = 0;
foreach( Sequence s in this.diagram.SequenceDiagrams )
{
float posBDx = position;
float posBDy = this.ButtonDiagramGameObject.transform.position.y;
float posBDz = this.ButtonDiagramGameObject.transform.position.z;
Vector3 posButtonDiagram = new Vector3 (posBDx, posBDy, posBDz);
ins = (GameObject)Instantiate (this.ButtonDiagramGameObject, posButtonDiagram, Quaternion.identity) ;
ins.GetComponentInChildren<ButtonDiagram> ().NameDiagram ( s.Name );
instances.Add(ins);
position += increment;
}
}
}
// Update is called once per frame
void Update ()
{
foreach( GameObject i in instances ){
i.GetComponentInChildren<ButtonDiagram>().Click();
}
}
}
using UnityEngine;
using System.Collections;
public class ButtonDiagram : MonoBehaviour {
public TextMesh Name;
public GameObject MyCube;
private string nameDiagram;
private float random;
// Use this for initialization
void Start () {
// random = Random.Range(-10.0f, 10.0f);
// NameDiagram = random.ToString();
Name.text = nameDiagram;
}
public void NameDiagram( string nome ){
this.nameDiagram = nome;
}
public void Click(){
if( Input.GetMouseButtonDown(0) )
{
Debug.Log("Click!");
}
}
// Update is called once per frame
void Update () {
}
}