GameObject.FindGameObjectsWithTag

参数

描述

检索一个包含所有使用指定标记标记的活动 GameObject 的数组。如果没有任何 GameObject 具有该标记，则返回一个空数组。

必须在使用标签之前在标签管理器中声明标签。如果标签不存在，或者如果提供了空字符串或 null 作为 tag 参数，则将抛出 UnityException。

// Instantiates respawnPrefab at the location
// of all GameObjects 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);
        }
    }
}

另一个示例

// Find the name of the closest enemy

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public 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;
    }
}

另一个示例，测试空数组

using UnityEngine;

// Search for GameObjects with a tag that is not used

public class Example : MonoBehaviour
{
    void Start()
    {
        GameObject[] gameObjects;
        gameObjects = GameObject.FindGameObjectsWithTag("Enemy");

        if (gameObjects.Length == 0)
        {
            Debug.Log("No GameObjects are tagged with 'Enemy'");
        }
    }
}