Unity2D游戏开发-游戏对象和组件的查找方式

GameObject[] objects = FindObjectsOfType<GameObject>();

GameObject obj = GameObject.FindWithTag("Player");

GameObject obj = GameObject.Find("Player");

// 获取当前游戏对象的父对象
Transform parent = transform.parent;

// 通过父对象获取父游戏对象
GameObject parentGameObject = parent.gameObject;

Transform child = transform.Find("SubObject");

// 获取第一个子游戏对象
Transform child0 = transform.GetChild(0); 

// 获取第二个子游戏对象
Transform child1 = transform.GetChild(1);

for (int i = 0; i < transform.childCount; i++)
{
  Transform child = transform.GetChild(i);
  GameObject childGameObject = child.gameObject;

  // ...
}

// 递归获取所有子对象
void GetAllChildren(Transform parent, List<Transform> results)
{
  foreach (Transform child in parent) 
  {
    results.Add(child);
    GetAllChildren(child, results);
  }
}

// 用法:
List<Transform> allChildren = new List<Transform>();
GetAllChildren(transform, allChildren);

Collider2D[] colliders = Physics2D.OverlapCircleAll(
    this.transform.position,
    100
);
foreach (Collider2D collider in colliders)
{
    if (collider.gameObject.CompareTag("Enemy"))
    {
        Debug.Log("发现敌人！");
    }
}

Collider2D[] colliders = Physics2D.OverlapCircleAll(
    this.transform.position,
    100,
    1 << LayerMask.NameToLayer("Enemy")
);
foreach (Collider2D collider in colliders)
{
    Debug.Log("发现敌人！");
}

// 创建一个从 transform.position 开始的射线
Vector2 rayOrigin = this.transform.position;
Vector2 rayDirection = Vector2.right;
// 射线检测
RaycastHit2D hit = Physics2D.Raycast(
    rayOrigin,
    rayDirection,
    100,
    1 << LayerMask.NameToLayer("Enemy")
);
// 如果射线击中了碰撞体
if (hit)
{
    // 获取击中的碰撞体
    Collider2D collider = hit.collider;
    // 获取击中点的坐标
    Vector2 hitPoint = hit.point;
    // 做出响应...
    Debug.Log("射中敌人:" + collider.name + "位置:" + hitPoint.ToString());
}

Rigidbody rb = gameObject.GetComponent<Rigidbody>();