GameObject.FindGameObjectsWithTag

Parameters

Description

Returns a list of active GameObjects tagged tag. Returns empty array if no GameObject was found.

Tags must be declared in the tag manager before using them. A UnityException will be thrown if the tag does not exist or an empty string or null is passed as the tag.

#pragma strict
// Instantiates respawnPrefab at the location
// of all game objects tagged "Respawn".
public var respawnPrefab: GameObject;
public var respawns: GameObject[];
function Start() {
	if (respawns == null)
		respawns = GameObject.FindGameObjectsWithTag("Respawn");
	for (var respawn: GameObject in respawns) {
		Instantiate(respawnPrefab, respawn.transform.position, respawn.transform.rotation);
	}
}

// Instantiates respawnPrefab at the location
// of all game objects tagged "Respawn".

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public GameObject respawnPrefab;
    public GameObject[] respawns;
    void Start()
    {
        if (respawns == null)
            respawns = GameObject.FindGameObjectsWithTag("Respawn");

        foreach (GameObject respawn in respawns)
        {
            Instantiate(respawnPrefab, respawn.transform.position, respawn.transform.rotation);
        }
    }
}

Another example:

    // Find the name of the closest enemy
    function FindClosestEnemy () : GameObject {
        // Find all game objects with tag Enemy
        var gos : GameObject[];
        gos = GameObject.FindGameObjectsWithTag("Enemy");
        var closest : GameObject;
        var distance = Mathf.Infinity;
        var position = transform.position;
        // Iterate through them and find the closest one
        for (var go : GameObject in gos)  {
            var diff = (go.transform.position - position);
            var curDistance = diff.sqrMagnitude;
            if (curDistance < distance) {
                closest = go;
                distance = curDistance;
            }
        }
        return closest;
    }

// Find the name of the closest enemy

GameObject FindClosestEnemy()
{
    GameObject[] gos;
    gos = GameObject.FindGameObjectsWithTag("Enemy");
    GameObject closest = null;
    float distance = Mathf.Infinity;
    Vector3 position = transform.position;
    foreach (GameObject go in gos)
    {
        Vector3 diff = go.transform.position - position;
        float curDistance = diff.sqrMagnitude;
        if (curDistance < distance)
        {
            closest = go;
            distance = curDistance;
        }
    }
    return closest;
}
}

Another example, testing for empty array:

// Search for game objects with a tag that is not used

function Start () {
    var gos : GameObject[];
    gos = GameObject.FindGameObjectsWithTag("fred");

    if (gos.length == 0) {
        Debug.Log("No game objects are tagged with fred");
    }
}