Parent of RectTransform is being set with parent property. Consider using the SetParent method instead, with the worldPositionStays argument set to false.

Hi everyone,

I try to create an inventory follow the tutorial from https://www.youtube.com/watch?v=6twPV3e4crE

But when i try to copy the game object named Slot using instantiate, I got an error exclamation like this :

Parent of RectTransform is being set with parent property. Consider using the SetParent method instead, with the worldPositionStays argument set to false. This will retain local orientation and scale rather than world orientation and scale, which can prevent common UI scaling issues. UnityEngine.Transform:set_parent(Transform) inventory:addChilParent(GameObject, GameObject) (at Assets/script/inventory.cs:54) inventory:Start() (at Assets/script/inventory.cs:27)

I dont know what happen to this script. But it seem all is Ok. I do exactly same as the the tutorial.

Below is my code :

item.cs

    using UnityEngine;
    using System.Collections;

     // Make Class Item
     public class item {
 public string itemName;
  public int itemID;
  public string itemDesc;
 public Sprite itemIcon;
 public GameObject itemModel;
 public int itemTime;
 public int itemValue;
 public int itemStock;
 public ItemType itemType;
 private string baseName;

 // Use this for initialization
 void Start () {

 }
 
 // Update is called once per frame
 void Update () {
 
 }

 void Awake () {

 }

 public enum ItemType {
     AnimalBarm,
     Mining,
     Corps,
     Dairy,
     JuiceJamMaker,
     AnimalFood,
     Kitchen,
     Bakery,
     CraftHouse,
     RAM
 }

 public item (string name, int ID, string desc, int time, int value, int stock, ItemType type, string folder) {
     itemName = name;
     itemID = ID;
     itemDesc = desc;
     itemTime = time;
     itemValue = value;
     itemStock = stock;
     itemType = type;
     this.baseName = folder + "/";
     itemIcon = Resources.Load<Sprite> (this.baseName + itemName);
 }

 public item() {

 }

}

itemDatabase.cs

    using UnityEngine;
    using System.Collections;
    using System.Collections.Generic;

    public class itemDatabase : MonoBehaviour {
 public List<item> items = new List<item>();

 // Use this for initialization
 void Start () {
     // Add Data To Item List With Class Item
     items.Add (new item ("Apple", 0, "Red Sweet Apple", 720, 25, 5, item.ItemType.Corps,"Corps"));
     items.Add (new item ("BlueBerry", 1, "Sweet BlueBerry", 1440, 88, 5, item.ItemType.Corps,"Corps"));
     items.Add (new item ("Cabbage", 2, "This is my Cabbage", 3, 12, 5, item.ItemType.Corps,"Corps"));
     items.Add (new item ("Corn", 3, "Yellow Corn Sweet", 5, 13, 5, item.ItemType.Corps,"Corps"));
     items.Add (new item ("Lemon", 4, "Honey Lemon", 1020, 75, 5, item.ItemType.Corps,"Corps"));
     items.Add (new item ("Wheat", 5, "Natural Wheat", 2, 10, 5, item.ItemType.Corps,"Corps"));


 }
 
 // Update is called once per frame
 void Update () {
 
 }

}

Inventory.cs

    using UnityEngine;
    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine.UI;

    public class inventory : MonoBehaviour {
 public List<GameObject> slotsx = new List<GameObject> ();
 public List<item> itemx = new List<item> ();
 public GameObject slots;
 public GameObject toolTip;
 public GameObject dragitemicon;
 public bool draggingitem = false;

 itemDatabase database;

 // Use this for initialization
 void Start () {
     int slotAmount = 0;

     database = GameObject.FindGameObjectWithTag ("itemDatabase").GetComponent<itemDatabase> ();
     // Generate the Slot and Slot Name;
     for(int i = 1; i <= 24; i++) {
             GameObject Slot = (GameObject) Instantiate(slots);
             //Slot.GetComponent<slotScript>().slotNumber = slotAmount;
             slotsx.Add(Slot);
             itemx.Add(new item());
             addChilParent (this.gameObject,Slot);
             //Slot.transform.parent = this.gameObject.transform;
             Slot.name = "slot-" + i;
             slotAmount++;
     }

     AddItem (0);
     AddItem (1);
     AddItem (2);
     AddItem (3);
     AddItem (4);
     AddItem (5);
 }

 // Update is called once per frame
 void Update () {
     if (draggingitem) {
         Vector3 post = (Input.mousePosition - GameObject.FindGameObjectWithTag("Canvas").GetComponent<RectTransform>().localPosition);
         //Vector3 post = new Vector3(Input.mousePosition.x,Input.mousePosition.y,Input.mousePosition.z);
         //Debug.Log (post);
         //Vector3 post = Input.mousePosition;
         dragitemicon.GetComponent<RectTransform>().localPosition = post;

     }
 }

 public void addChilParent(GameObject parentx, GameObject childx) {
     childx.transform.parent = parentx.gameObject.transform;

 }

 void AddItem(int ID) {
     for (int i = 0; i < database.items.Count; i++) {
         if(database.items[i].itemID == ID) {
             item itemxs = database.items[i];
             AddItemEmptySlot(itemxs);
             break;
         }
     }
 }

 void AddItemEmptySlot (item items) {
     for (int i = 0; i < itemx.Count; i++) {
         if(itemx[i].itemName == null) {
             itemx[i] = items;
             break;
         }
     }
 }

 public void showToolTip ( Vector3 position, item item) {
     toolTip.SetActive (true);
     toolTip.GetComponent<RectTransform> ().localPosition = new Vector3 (position.x + 70, position.y - 50, position.z);

     toolTip.transform.GetChild (0).GetComponent<Text> ().text = item.itemName;
     toolTip.transform.GetChild (1).GetComponent<Text> ().text = item.itemDesc;
     toolTip.transform.GetChild (2).GetComponent<Text> ().text = item.itemTime.ToString();
     toolTip.transform.GetChild (3).GetComponent<Text> ().text = item.itemValue.ToString();
     toolTip.transform.GetChild (4).GetComponent<Text> ().text = item.itemStock.ToString();

 }

 public void closeToolTips () {
     toolTip.SetActive (false);
 }

 public void showDragItem (item item) {
     dragitemicon.SetActive (true);
     draggingitem = true;
     dragitemicon.GetComponent<Image> ().sprite = item.itemIcon;

 }

}

slotScript.cs

     using UnityEngine;
     using System.Collections;
     using UnityEngine.UI;
     using UnityEngine.EventSystems;
     using System.Collections.Generic;

     public class slotScript : MonoBehaviour, IPointerDownHandler, IPointerEnterHandler, IPointerExitHandler, IDragHandler {
 public item itemx;
 Image itemImage;
 public int slotNumber;
 inventory inventoryx;

 // Use this for initialization

 void Start () {
     inventoryx = GameObject.FindGameObjectWithTag ("inventory").GetComponent<inventory> ();
     itemImage = gameObject.transform.GetChild (0).GetComponent<Image> ();
 }
 
 // Update is called once per frame

 void Update () {
     if (inventoryx.itemx[slotNumber].itemName !=  null) {
         itemx = inventoryx.itemx[slotNumber];
         itemImage.enabled = true;
         itemImage.sprite = inventoryx.itemx[slotNumber].itemIcon;

     } else {
         itemImage.enabled = false;
     }

 }


 public void OnPointerDown (PointerEventData data) {
     Debug.Log (transform.name);
 }

 public void OnPointerEnter (PointerEventData data) {
     if (inventoryx.itemx [slotNumber].itemName != null) {
         inventoryx.showToolTip(inventoryx.slotsx[slotNumber].GetComponent<RectTransform>().localPosition,inventoryx.itemx[slotNumber]);
         Debug.Log(inventoryx.slotsx[slotNumber].GetComponent<RectTransform>().localPosition);
     }
 }

 public void OnPointerExit (PointerEventData data) {
     if (inventoryx.itemx [slotNumber].itemName != null) {
         inventoryx.closeToolTips ();
     }
 }
  
 public void OnDrag (PointerEventData Data) {
     if (inventoryx.itemx [slotNumber].itemName != null) {
         inventoryx.showDragItem(inventoryx.itemx[slotNumber]);

     }
 }

}

The error exclamation is on script inventory.cs which is on line : addChilParent (this.gameObject,Slot); and

on method : childx.transform.parent = parentx.gameObject.transform;

The gameobject was copied and run successfull same as the tutorial but mine got error exclamation. Thats all the code i type. The video i have followed is from part 1 to part 4. and the problem is exist on part 1.

What is the meaning of the error exclamation and how to fix it ?

Thanks Everyone.