我想在一个特定的圆形区域内销毁一个对象的实例.代码如下：
Collider2D[] overlap = Physics2D.OverlapCircleAll(
ball.transform.position,(ball.renderer.bounds.size.x)/2);
if (overlap.Length>=1)
{
foreach (Collider2D coll in overlap)
{
Debug.Log (coll.GetInstanceID());
if (coll.name.Contains("alien"))
{
//problem here:
Destroy (coll.gameObject);
}
}
}
Destroy(coll.gameObject)永久地破坏了所有克隆,并且没有实例化新的克隆并且我得到错误MissingReferenceException：类型’GameObject’的对象已经被破坏但你仍然试图访问它.
您的脚本应该检查它是否为null或者您不应该销毁该对象.
有没有办法摧毁那个特定的克隆？我尝试了不同的名称并使用Destroy(GameObject.Find(coll.name)),但它也会破坏所有克隆并阻止新的产生.
有人帮忙吗？
更新：
实例化如下：
private bool bCanCreateParachuter = true; // bool to stop the spawning
GameObject go;
// Use this for initialization
void Start () {
//handling screen orientation
Screen.orientation = ScreenOrientation.LandscapeLeft;
///
go = (GameObject)Instantiate(Resources.Load("alienPink"));
StartCoroutine("CreateParachuter");
}
IEnumerator CreateParachuter()
{
while(bCanCreateParachuter)
{
Instantiate(go,new Vector3(Random.Range(-10,10),Random.Range(-5,5),0),Quaternion.identity);
// Instantiate(go,Random.Range(-10,Quaternion.identity);
go.name = "alienPink"+nextNameNumber;
nextNameNumber++;
yield return new WaitForSeconds(Random.Range(0f,1f));
yield return null;
}
yield return null;
}
关键更新：
如果我取消注释if(grabbedObject！= null)in,代码可以工作
// if (grabbedObject != null) {
//works if uncomment above for some reason
Collider2D[] overlap = Physics2D.OverlapCircleAll (ball.transform.position,(ball.renderer.bounds.size.x)/2);
if (overlap.Length>=1){
foreach (Collider2D coll in overlap){
Debug.Log (coll.GetInstanceID());
if (coll.name.Contains("alien")){
Destroy (coll.gameObject);
}
}
}else {
// Debug.Log (grabbedObject.renderer.bounds.size.x);
}
这是grabbedObject的背景：
Rigidbody2D grabbedObject = null;
. . .
RaycastHit2D hit = Physics2D.Raycast(mousePos2D,dir);
//if (hit!=null && hit.collider!=null){
// check collisions with aliens
// OnCollisionEnter2D(grabbedObject.collisionDetectionMode);
if ( hit.collider!=null){
// we clicked on something lol... something that has a collider (Box2d collider in this case)
if (hit.collider.rigidbody2D!=null){
//hit.collider.rigidbody2D.gravityScale = 1;
grabbedObject = hit.collider.rigidbody2D;
// circleCollider = hit.collider.collider2D. ;
springJoint = grabbedObject.gameObject.AddComponent<SpringJoint2D>();
// set the anchor to the spot on the object that we clicked
Vector3 localHitPoint = grabbedObject.transform.InverseTransformPoint(hit.point);
springJoint.anchor = localHitPoint;
//
dragLine.enabled = true;
}
}
基本上,grabbedObject是你在屏幕上点击并拖动的任何东西(任何GameObject),我在这里想念的是什么？
解决方法
重生问题是您没有保存对资源项的引用,因此当您销毁第一个项时,您创建实例化的“模板”将被销毁
这可以解决这个问题
GameObject template;
void Start()
{
//handling screen orientation
Screen.orientation = ScreenOrientation.LandscapeLeft;
template = (GameObject)Resources.Load("alienPink");
StartCoroutine("CreateParachuter");
}
IEnumerator CreateParachuter()
{
while(bCanCreateParachuter)
{
GameObject go = Instantiate(template,1f));
yield return null;
}
yield return null;
}
在破坏所有克隆方面,你的调试日志是说它正在销毁多个项目吗？如果是这样,碰撞可能确实击中了所有克隆,从而将它们全部摧毁.
