Version: 2020.3

Collider2D.OnTriggerEnter2D(Collider2D)

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参数

other 该碰撞中涉及的其他 Collider2D

描述

当另一个对象进入附加到该对象的触发碰撞体时发送(仅限 2D 物理)。

在调用期间传入的 Collider2D 参数中报告有关其他碰撞体的进一步信息。

触发器事件将发送到已禁用的 MonoBehaviours,以便允许启用 Behaviours,以响应碰撞。

请参阅:Collider2D 类以及 OnTriggerExit2DOnTriggerStay2D 消息。

此处显示了一个 OnTriggerEnter2D 示例。此示例有两个空的 GameObject,分别名为 GameObject1 和 /GameObject2/。这两个游戏对象都有脚本文件能使本示例正常工作。第一个脚本是 /Example1/,用于创建 Sprite 并添加 BoxCollider2DRigidbody2D。此对象受重力下落并与 Example2 发生碰撞。Example2 无法看到显示效果。(它创建的矩形在 Scene 窗口中可见。)这两个 GameObject 都会报告碰撞。

以下脚本是 Example1。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Create GameObject1 that falls under gravity. It will pass through // Example2 and cause a collision. GameObject1 is moved back to // the start position and it will again start to fall under gravity.

public class Example1 : MonoBehaviour { void Awake() { SpriteRenderer sr; sr = gameObject.AddComponent<SpriteRenderer>() as SpriteRenderer; sr.color = new Color(0.9f, 0.9f, 0.1f, 1.0f);

BoxCollider2D bc; bc = gameObject.AddComponent<BoxCollider2D>() as BoxCollider2D; bc.size = new Vector2(1.0f, 1.0f);

Rigidbody2D rb; rb = gameObject.AddComponent<Rigidbody2D>() as Rigidbody2D; rb.gravityScale = 1.0f;

// A square in the Resources folder is used. gameObject.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("square");

// GameObject1 starts 3 units in the Up direction. gameObject.transform.position = new Vector3(0.0f, 3.0f, 0.0f); gameObject.transform.localScale = new Vector3(0.5f, 0.5f, 1.0f); }

private float timer = 0.0f; private bool restart = false;

void FixedUpdate() { if (restart == true) { timer = timer + Time.deltaTime; if (timer > 0.25f) { gameObject.transform.position = new Vector3(0.0f, 3.0f, 0.0f); gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(0.0f, 0.0f); restart = false; } } }

// called when this GameObject collides with GameObject2. void OnTriggerEnter2D(Collider2D col) { Debug.Log("GameObject1 collided with " + col.name); restart = true; timer = 0.0f; } }

这是 /Example2/,即第二个 GameObject 的碰撞脚本:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Create a rectangle that the other GameObject will collide with. // Note that this GameObject has no visibility. // (View in the Scene view to see this GameObject.)

public class Example2 : MonoBehaviour { void Awake() { BoxCollider2D bc; bc = gameObject.AddComponent<BoxCollider2D>() as BoxCollider2D; bc.size = new Vector2(3.0f, 1.0f); bc.isTrigger = true;

gameObject.transform.localScale = new Vector3(3.0f, 1.0f, 1.0f); gameObject.transform.position = new Vector3(0.0f, -2.0f, 0.0f); }

void OnTriggerEnter2D(Collider2D col) { Debug.Log("GameObject2 collided with " + col.name); } }