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我们知道在OnValidate中创建游戏物体会发出警告，删除游戏物体会报错。
所以我们使用协程，将开始动作的信号放在OnValidate中，将动作的执行放在帧结尾。

参考代码如下：

using System.Collections;
using UnityEngine;public class VerticalList : MonoBehaviour
{
#if UNITY_EDITOR[SerializeField]private int _childrenAmount = 0;void OnValidate(){_childrenAmount = Mathf.Max(_childrenAmount, 0);StartCoroutine(KeepChildrenAmount());}IEnumerator KeepChildrenAmount(){yield return new WaitForEndOfFrame();for (int i = transform.childCount - 1; i >= _childrenAmount; --i)DestroyImmediate(transform.GetChild(i).gameObject);while (transform.childCount < _childrenAmount){GameObject obj = new();obj.transform.parent = transform;}}
#endif
}