演示了 OnTriggerEnter、OnTriggerStay、OnTriggerExit 的基本用法。

碰到红色（Red 标签）扣血，碰到绿色（Green 标签）回复，在紫色（Purple 标签）里中毒，在黄色（Yellow 标签）里减速。

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    public float health = 10f;
    public float speed = 2f;
    private float _totalTime;

    private void OnTriggerEnter(Collider other)
    {
        switch (other.tag)
        {
            case "Red":
                health -= 2f;
                break;
            case "Green":
                health += 1f;
                break;
        }
    }

    private void OnTriggerStay(Collider other)
    {
        if (other.CompareTag("Purple"))
        {
            _totalTime += Time.deltaTime;
            if (_totalTime >= 1f)
            {
                health -= 0.5f;
                _totalTime = 0f;
            }
        }
        else if (other.CompareTag("Yellow"))
        {
            speed = 1f;
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.CompareTag("Yellow"))
        {
            speed = 2f;
        }
    }
}