I'm attempting to create a new button game object. When I click the button to create the new game objects, it does not assign the game objects to the parent I'm telling it to.

 public void DisplayUpgrades()
    {
        // Get the RectTransform component of the shop panel
        RectTransform shopPanelRectTransform = shopPanel.GetComponent<RectTransform>();


        // Set the initial position of the first button to 0
        float yPos = 0;

        foreach (var upgrade in upgrades)
        {
            // Create a new button game object
            GameObject button = new GameObject();
            button.name = "UpgradeButton";

            // Set the parent of the button to the shop panel
            button.transform.parent = shopPanel;

            // Set the size of the button to 10 units wide and 10 units tall
            button.transform.localScale = new Vector3(10, 10, 1);

            // Add a RectTransform component to the button
            RectTransform rectTransform = button.AddComponent<RectTransform>();

            // Set the position of the button using the RectTransform component
            rectTransform.localPosition = new Vector3(0, yPos, 0);

            rectTransform.sizeDelta = new Vector2(150, 20);

            // Add a Button component to the button
            Button btn = button.AddComponent<Button>();

            btn.transform.SetParent(shopPanel);

            // Add a TextMeshProUGUI component to the button
            TextMeshProUGUI text = button.AddComponent<TextMeshProUGUI>();
            text.transform.SetParent(shopPanel);

            // Set the font size of the text to 20 pixels
            text.fontSize = 8;
            text.alignment = TextAlignmentOptions.Center;

            // Set the text of the button to the name and cost of the upgrade
            text.text = $"{upgrade.Key}: cost: {upgrade.Value.cost}";

            // Add a listener to the button to handle when it is clicked
            btn.onClick.AddListener(() => PurchaseUpgrade(upgrade.Key));

            // Increment the y position by 20 pixels for the next button
            yPos  = 90;
        }
    }

To give some more info, I have 2 GUI elements, a canvas named 'Canvas' (parent of shopPanel), and 'shopPanel'. When I create new objects, they are being created as children of 'Canvas' rather than 'shopPanel'. 'shopPanel' is a Rect Transform. 'Canvas', also is a Rect Transform. I am needing 'button' to be a child of 'shopPanel' because when I want to add additional GUI elements, I don't want the addtl GUI elements to be destroyed when I attempt to destroy the children of shopPanel.

I have attempted button.transform.parent = shopPanel;, button.transform.SetParent(shopPanel). I have tried to see if 'button' is a child of 'shopPanel', and if it isn't, assign it as the Parent. I have tried creating different canvas's and different shop panels. I've tried restarting the program and my computer. Nothing has worked this far.

CodePudding user response：

From the code you provided, there is no reference to shopPanel, only to shopPanelRectTransform. As a result, your newly created GameObjects are being parented to the Canvas as opposed to your shopPanel.

Testing your code, it appears to work as intended with the shopPanel reference assigned:

The shopPanel assigned in the Inspector:

The code with a place-holder _upgrades Dictionary:

[SerializeField] private Transform shopPanel;
private readonly Dictionary<int, float> _upgrades = new();

private void Start()
{
    _upgrades.Add(3, 30.0f);
    _upgrades.Add(2, 20.0f);
    _upgrades.Add(1, 10.0f);
    DisplayUpgrades();
}

public void DisplayUpgrades()
{
    float yPos = 0;
    foreach (var upgrade in _upgrades)
    {
        var button = new GameObject
        {
            name = "UpgradeButton",
            transform =
            {
                // Set the parent of the button to the shop panel
                parent = shopPanel,
                // Set the size of the button to 10 units wide and 10 units tall
                localScale = new Vector3(10, 10, 1)
            }
        };
        
        var rectTransform = button.AddComponent<RectTransform>();
        
        rectTransform.localPosition = new Vector3(0, yPos, 0);
        rectTransform.sizeDelta = new Vector2(150, 20);
        
        var btn = button.AddComponent<Button>();
        btn.transform.SetParent(shopPanel);
        
        var text = button.AddComponent<TextMeshProUGUI>();
        text.transform.SetParent(shopPanel);
        
        text.fontSize = 8;
        text.alignment = TextAlignmentOptions.Center;
        text.text = $"{upgrade.Key}: cost: {upgrade.Value}";
        
        btn.onClick.AddListener(() => PurchaseUpgrade(upgrade.Key));
        yPos  = 90;
    }
}

I also highly recommend that you look into using Prefabs. Instead of creating a new upgrade button from scratch, Prefabs will enable you to reuse a GameObject that you've previously created.