How I do spawn prefabs as children of another game object?

Questions & Answers
1

I am trying to spawn prefabs as the children of another game object so that object’s transform will affect the spawned prefabs as well. I appreciate any help.

Here is my code so far:

using UnityEngine;
using System.Collections;

public class Spawner : MonoBehaviour
{
public GameObject testObject;
public float xRange = 1.0f;
public float yRange = 1.0f;
public float minSpawnTime = 1.0f;
public float maxSpawnTime = 10.0f;

// Use this for initialization
void Start () 
{
	Invoke ("SpawnItem", Random.Range (minSpawnTime, maxSpawnTime));
}

// Update is called once per frame
void SpawnItem () 
{
	float xOffset = Random.Range (-xRange, xRange);
	float yOffset = Random.Range (-yRange, yRange);
	int spawnObjectIndex = Random.Range (0, testObject.Length);
	Instantiate (testObject [spawnObjectIndex], transform.position + new Vector3 (xOffset, yOffset, 0.0f), testObject [spawnObjectIndex].transform.rotation);
	testObject [spawnObjectIndex].transform.parent = transform; 
	Invoke ("SpawnItem", Random.Range (minSpawnTime, maxSpawnTime));
}

}

2

If you want your offsets to be affected by the parent position Instantiate them at Vector3.zero instead. Then afterwards apply your offsets to testObject.transform.localPosition

3

You are assiging the prefab as parent and not the Instance of the object you have spawned, you where close anyways, try whith this tiny modification

using UnityEngine; 
    using System.Collections;
    
    public class Spawner : MonoBehaviour { 
    public GameObject[] testObject; 
    public float xRange = 1.0f; 
    public float yRange = 1.0f; 
    public float minSpawnTime = 1.0f; 
    public float maxSpawnTime = 10.0f;
    
    // Use this for initialization
    void Start () 
    {
        Invoke ("SpawnItem", Random.Range (minSpawnTime, maxSpawnTime));
    }
     
    // Update is called once per frame
    void SpawnItem () 
    {
        float xOffset = Random.Range (-xRange, xRange);
        float yOffset = Random.Range (-yRange, yRange);
        int spawnObjectIndex = Random.Range(0, testObject.Length);
        GameObject goInst = (GameObject) Instantiate (testObject [spawnObjectIndex], transform.position + new Vector3 (xOffset, yOffset, 0.0f), testObject [spawnObjectIndex].transform.rotation);
         goInst.transform.parent = transform;
        Invoke ("SpawnItem", Random.Range (minSpawnTime, maxSpawnTime));
    }
    }