How to change a object's parent with it's children?

Questions & Answers
1

Object A has a child named B. B has many children named C, D,E,F and so on. I write a script to change B’s parent to another obj named Box. When the script run, Box becomes B’s parent, but B lost its children, and they all become A’s children. How can I change B’s parents with it’s all children in the script? ,Object A has a child named B, and object b has many children named C,D,E,F…I write a script and want to change B’s parent to Another object named BOX. When the script run, BOX becomes B’s parent, but B lost it’s children, and they all become A’s children. Too wired, How to change B’s parent with it’s all children?

2

Here is an extension method that will do it for you. As you use unity for years, your extension method class should get pretty beefy. The amount I have is insane, but extremely useful. I just pull it into every project I use.

using UnityEngine;

/// <summary>
/// Static class for our extensions - just place somewhere in your project
/// </summary>
public static class ExtensionMethods
{
    // It's really a reverse recursive - If you moved from top down, the children of the children would be lost
    public static void SetParentRecursive(this Transform transform, Transform newParent)
    {
        for (int i = transform.childCount - 1; i >= 0; --i)
        {
            Transform child = transform.GetChild(i);
            child.SetParent(newParent);
        }
    }
}

Here is a simple test script to make sure it works. Just place it on the B object, reference the Box object, then run your game, hit space bar. (Notice how the extension method is called - just like SetParent()

using UnityEngine;


public class TestParentingScript : MonoBehaviour
{
    [SerializeField] Transform newParent;


    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            transform.SetParentRecursive(newParent);
        }
    }
}
3

Thank you for your answer. I have already solved my problem, and the problem is C,D,E,F, which i wanna change parent are prefabs. I saw your method. Next time I’ll try to use it to change parent. Thank you, guy!