Unity - 如何在光标下方制作一系列 UI 游戏对象? [英] Unity - How do I make an array of UI game objects beneath the cursor?

问题描述

我希望能够创建一个数组，该数组包含数组内光标下的所有 UI 元素.这是因为我需要能够判断多个其他 UI 元素下方是否有一个 UI 元素，我尝试了其他技术，但它只显示顶部的 UI 元素.

I want to be able to make an array, which has all the UI elements, under the cursor , inside the array. This is because I need to be able to tell if there is a UI element beneath multiple other UI elements, I've tried other techniques, but it only shows the UI element on top.

为了更清楚，我正在尝试列出位于光标下方的所有 UI 部分，而不仅仅是能够分辨哪个 UI 位于顶部.

推荐答案

听起来您正在寻找 UI.GraphicRaycaster.Raycast.

Sounds like you are looking for UI.GraphicRaycaster.Raycast.

GraphicRaycaster 通常附加到每个 Canvas(否则你将无法与其中的任何内容交互).

The GraphicRaycaster is usually attached to each Canvas (otherwise you wouldn't be able to interact with anything in them).

因此，无需引用特定的画布，您就可以将它们全部获取:

So without referencing a specific canvas you could just go and get them all:

// Because this is dynamically changing I recommend to stick to a List instead of an array
private List<RaycastResult> _hits = new List<RaycastResult>();

private EventSystem _eventSystem;

private void Awake()
{
    //Fetch the Event System from the Scene
    _eventSystem = FindObjectOfType<EventSystem>();
}
    
private void Update()
{
    //Check if the left Mouse button is clicked
    if (Input.GetKeyDown(KeyCode.Mouse0))
    {
        //Set up the new Pointer Event
        var eventData = new PointerEventData(_eventSystem) {position = Input.mousePosition};

        //Create a list of Raycast Results
        _hits.Clear();

        // Get all existing graphicsRaycaster
        // NOTE: Of course you should rather cache this result e.g. in Awake
        // and only update it if a Canvas is added to or removed from the scene
        var graphicsRaycasters = FindObjectsOfType<GraphicRaycaster>();

        foreach(var graphicsRaycaster in graphicsRaycasters)
        {
            graphicsRaycaster.Raycast(eventData, _hits);
        }

        // Do something with the hits
        foreach (var result in _hits)
        {
            Debug.Log(result.gameObject.name, result.gameObject);
        }
    }
}

这篇关于Unity - 如何在光标下方制作一系列 UI 游戏对象?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！