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Creator 版本： 3.8.2
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目标平台： Edge
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重现方式：
我在做一个2d横板游戏，想让角色触碰到地面时候，发生碰撞检测回调。我给角色设置了collider2d 和 rigidbody2d，给地面增加了collider2d组件。然后我勾选了角色的rigidbody2d的Enabled Contact Listener的选项。在角色的脚本中添加了如下代码：
`
import { _decorator, Component, input, Input, Node, EventKeyboard,KeyCode, RigidBody2D, Vec2, Vec4, Collider2D, Contact2DType, IPhysics2DContact } from ‘cc’;
const { ccclass, property } = _decorator;
@ccclass(‘Movement’)
export class Movement extends Component {
@property({type: Number})
speed: number = 100;
velocity: Vec2 = new Vec2(0, 0);
rb2d: RigidBody2D | null = null;
// collider2d: Collider2D | null = null;
direction: Vec2 = new Vec2(0, 0);
jumpCount: number = 2;
start() {
this.rb2d = this.node.getComponent(RigidBody2D);
const collider2d = this.node.getComponent(Collider2D);
input.on(Input.EventType.KEY_DOWN, this.onKeyDown, this);
collider2d.on(Contact2DType.BEGIN_CONTACT, this.onBeginContact, this);
collider2d.on(Contact2DType.END_CONTACT, this.onEndContact, this);
}
onKeyDown(key: EventKeyboard ) {
switch(key.keyCode)
{
case KeyCode.ARROW_UP:
case KeyCode.KEY_W:
if(this.jumpCount)
{
this.rb2d.applyLinearImpulseToCenter(new Vec2(0, this.speed), true);
this.jumpCount--;
}
// this.velocity.y = this.speed;
break;
case KeyCode.ARROW_RIGHT:
case KeyCode.KEY_D:
// this.velocity.x = this.speed;
this.rb2d.applyLinearImpulseToCenter(new Vec2(this.speed, 0), true);
break;
case KeyCode.ARROW_DOWN:
case KeyCode.KEY_S:
// this.rb2d.applyLinearImpulseToCenter(new Vec2(0, this.speed), true);
break;
case KeyCode.ARROW_LEFT:
case KeyCode.KEY_A:
// this.velocity.x = -this.speed;
this.rb2d.applyLinearImpulseToCenter(new Vec2(-this.speed, 0), true);
break;
}
// this.rb2d.linearVelocity = this.velocity;
}
update(deltaTime: number) {
// console.log(this.rb2d.linearVelocity)
}
onBeginContact(selfCollider: Collider2D, otherCollider: Collider2D, contact: IPhysics2DContact | null) {
console.log(123)
}
onEndContact(selfCollider: Collider2D, otherCollider: Collider2D, contact: IPhysics2DContact | null) {
console.log(123)
}
}
`
可是在浏览器中就报错了，提示Cannot read properties of null (reading ‘enabledContactListener’)
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首个报错：
physics-contact.ts:242 Uncaught TypeError: Cannot read properties of null (reading ‘enabledContactListener’)
at PhysicsContact.emit (physics-contact.ts:242:20)
at PhysicsContactListener._onPreSolve [as _PreSolve] (physics-world.ts:417:11)
at PhysicsContactListener.PreSolve (physics-contact-listener.ts:76:18)
at b2PolygonContact.Update (box2d.umd.js:11809:24)
at b2ContactManager.Collide (box2d.umd.js:12479:17)
at b2World.Step (box2d.umd.js:19588:33)
at b2PhysicsWorld.step (physics-world.ts:162:21)
at PhysicsSystem2D.postUpdate (physics-system.ts:295:31)
at Director.tick (director.ts:692:38)
at Game._updateCallback (game.ts:1039:22)