RectTransform.deltaSize在Unity中不起作用

Question

我有一个选择菜单代码：

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

public class SelectionMenu : MonoBehaviour
{
    public List<MenuButton> buttons = new List<MenuButton>();
    public GameObject canvas;
    private Vector2 Mouseposition;
    private Vector2 fromVector2M = new Vector2(0.5f, 1.0f);
    private Vector2 centercircle = new Vector2(0.5f, 0.5f);
    private Vector2 toVector2M;

    public int menuItems;
    public int CurMenuItem;
    private int OldMenuItem;
    private bool isDone = false;
    // Start is called before the first frame update
    void Start()
    {
        canvas.SetActive(false);
        menuItems = buttons.Count;
        foreach (MenuButton button in buttons)
        {
            button.sceneImage.color = button.NormalColor;
        }
        CurMenuItem = 0;
    }

    // Update is called once per frame
    void Update()
    {
        GetCurrentMenuItem();
        if (Input.GetButtonDown("Fire1"))
            ButtonAction();
        if (Input.GetKey(KeyCode.Mouse1) && !isDone)
        {
            canvas.SetActive(true);
            CrossHair.ok = true;
        }
        else
        {
            canvas.SetActive(false);
            CrossHair.ok = false;
        }
        if (Input.GetKeyUp(KeyCode.Mouse1))
        {
            isDone = false;
        }
    }

    public void GetCurrentMenuItem()
    {
        Mouseposition = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
        toVector2M = new Vector2(Mouseposition.x / Screen.width, Mouseposition.y / Screen.height);
        float angle = (Mathf.Atan2(fromVector2M.y - centercircle.y, fromVector2M.x - centercircle.x) - Mathf.Atan2(toVector2M.y - centercircle.y, toVector2M.x - centercircle.x)) * Mathf.Rad2Deg;
        if (angle < 0)
            angle += 360;
        CurMenuItem = (int)(angle / (360 / menuItems));
        if(CurMenuItem != OldMenuItem)
        {
            buttons[OldMenuItem].sceneImage.color = buttons[OldMenuItem].NormalColor;
            RectTransform oldTrans = buttons[OldMenuItem].sceneImage.gameObject.GetComponent<RectTransform>();


            oldTrans.sizeDelta = new Vector3(250, 250);
            Debug.Log("Resized: " + buttons[OldMenuItem].name);
            OldMenuItem = CurMenuItem;

            buttons[CurMenuItem].sceneImage.color = buttons[CurMenuItem].HighlightedColor;
            RectTransform newTrans = buttons[CurMenuItem].sceneImage.gameObject.GetComponent<RectTransform>();
            oldTrans.sizeDelta = new Vector3(280, 280);
        }
    }

    public void ButtonAction()
    {
        buttons[CurMenuItem].sceneImage.color = buttons[CurMenuItem].PressedColor;
        if(CurMenuItem == 0)
        {
            SetColor.color = buttons[CurMenuItem].HighlightedColor;
        }
        isDone = true;
    }
}
[System.Serializable]
public class MenuButton
{
    public string name;
    public Image sceneImage;
    public Color NormalColor = Color.white;
    public Color HighlightedColor = Color.grey;
    public Color PressedColor = Color.gray;

}

除一件事外，一切都按预期工作：缩放比例不按预期工作。这行：

oldTrans.sizeDelta = new Vector3(280, 280);

此行仅在我离开突出显示的选择（菜单项/按钮）后才运行 而不是当它开始突出显示时。它之所以怪异，是因为在它之前的一行我将按钮设置为突出显示，并且直到它不再突出显示之后，该行才会运行。另外，这一行：

oldTrans.sizeDelta = new Vector3(250, 250);

完全不运行。每次该行日志之后立即显示的Debug.Log。

Answer 1

您不能直接修改sizeDelta

sizeDelta会告诉您此RectTransform相对于其父级要大或小。为了更改此设置，您必须修改锚点。如果您试图将RectTransform设置为具有基于其内容的大小，那么也许Google Cloud Natural Language API - How is document magnitude calculated?就是您所要的。