FindGameObjectsWithTag 不返回对象 [英] FindGameObjectsWithTag not returning objects

问题描述

前言/*我最近开始搞混统一:像大多数人一样制作了初学者的乒乓球游戏，现在我一直在尝试使用 3d 对象.我的想法是制作一个塔防游戏，所以我有一个塔和一个临时目标假人.塔有一个脚本，它应该允许它找到最近的带有敌人标签的物体并画一条线，但这里是问题:*/

PREAMBLE /* I have recently started messing about with unity: made a beginner's pong game as most do and I've been trying to work with 3d objects now. My idea was to make a tower defense game, so I have a tower and a temporary target dummy. The tower has a script which should allow it to find the nearest object with the enemy tag and draw a line to it, but here is the issue:*/

我的 GameObject.FindGameObjectsWithTag("Enemy") 函数返回一个空数组，尽管场景中有一个标记的启用对象.

My GameObject.FindGameObjectsWithTag("Enemy") function is returning an empty array, although there is a tagged, enabled object on the scene.

public class Attack : MonoBehaviour
{

    GameObject[] enemies;
    float dist;
    GameObject target = null;
    bool targeted = false;
    float range = 1000;

    bool FindTarget()
    {
        bool found = false;
        enemies = GameObject.FindGameObjectsWithTag("Enemy");
        //print(GameObject.FindGameObjectsWithTag("Enemy"));
        foreach (GameObject enemy in enemies)
        {
            float tmpd = Vector3.Distance(enemy.transform.position, transform.position);
            if (tmpd <= range && dist > tmpd)
            {
                dist = tmpd;
                target = enemy;
                found = true;
            }
        }
        return found;
    }

    // Update is called once per frame
    void Update()
    {
        if (!targeted)
            targeted = FindTarget();
        else {
            Debug.DrawLine(target.transform.position, transform.position, Color.red);
            dist = Vector3.Distance(target.transform.position, transform.position);
            if (dist > range)
                targeted = false;
        }
    }
}

我已经看了一千个其他线程，但找不到我的问题所在.任何帮助将不胜感激.

I've looked though a thousand other threads and cannot find what my problem is. Any help would be greatly appreciated.

推荐答案

如果你还没有调试过这段代码，你可以检查一下 if (tmpd <= range && dist > tmpd) 正在通过.

In case you haven't debugged this code you can check if if (tmpd <= range && dist > tmpd) is passing through.

但是假设您已经调试了代码并且它实际上没有找到任何对象，那么我建议您使用它:

But let's assume that you've debugged the code and it acctualy haven't found any object then i would suggest you to use this:

var allObjects = GameObject.FindObjectsOfType(typeof(GameObject)) as GameObject[]; // this will grab all GameObjects from the current scene!
foreach(GameObejct obj in allObjects) {
    if(obj.Tag == "Enemy") {
        // do some magic here
    }
}

如果前面的例子不起作用，你可以使用这个:

In case previous example would not work, you can use this:

List<GameObject> allObjects = new List<GameObject>();
Scene activeScene = SceneManager.GetActiveScene();
activeScene.GetRootGameObjects( allObjects );
foreach(GameObject obj in allObjects) {
    if(obj.Tag == "Enemy") {
        // do some magic here
    }
}

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