属性 UnityEngine.RequireComponent 在此声明类型上无效.它仅对类声明有效

Question

我正在尝试使用Unity2D编写我的第一个游戏"Tappy Bird"。当我尝试运行该应用程序时，我在 Unity 中收到以下错误消息：

资产/脚本/分流控制器.cs(6,6(：错误 CS0592：属性 UnityEngine.RequireComponent 在此声明类型上无效。 它仅对类声明有效

法典：

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

public class NewBehaviourScript : MonoBehaviour
{
[RequireComponent(typeof(Rigidbody2D))]
public float tapForce = 10;
public float tiltSmooth = 5;
public Vector3 startPos;
Rigidbody2D rigidbody;
Quaternion downRotation;
Quaternion forwardRotation;
void Start()
{
rigidbody = GetComponent<Rigidbody2D();
downRotation = Quaternion.Euler(0, 0, -90);
forwardRotation = Quaternion.Euler(0, 0, 35);
}
void update()
{
if (input.GetMouseButtonDown(0))
{
transform.rotation = forwardRotation;
rigidbody.AddForce(vector2.up * tapForce, ForceMode2D.Force);
}
transform.rotation = Quaternion.Lerp(
transform.rotation, downRotation, tiltSmooth * Time.deltaTime);
}
void onTriggerEnter2D(Collider2D col){
if(col.gameObject.tag == "ScoreZone") {
//register a Score event
//play sound
}
if(col.gmeObject.tag == "DeadZone") {
//register a dead event
//play a sound
}
}
}

Answer 1

如果我理解你的代码正确，你应该在类声明之前添加属性：

[RequireComponent(typeof(Rigidbody2D))]
public class NewBehaviourScript : MonoBehaviour
{
...
}

Answer 2

将所需组件添加为依赖项的 RequireComponent 属性需要在类外部设置。

https://docs.unity3d.com/ScriptReference/RequireComponent.html

Answer 3

https://docs.unity3d.com/ScriptReference/RequireComponent.html

首先，它应该在类名的前面;

其次，如果已将脚本附加到游戏对象，则需要重新附加。

[RequireComponent(typeof(Rigidbody2D))]
public class NewBehaviourScript : MonoBehaviour
{
//...
}