Question

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

public class GenerateUIButtons : MonoBehaviour
{
    public GameObject buttonPrefab;
    public GameObject parent;
    public int numberOfButtons;
    public float spaceBetweenButtons;

    private Button[] buttons;

    // Start is called before the first frame update
    void Start()
    {
        buttons = new Button[7];

        for (int i = 0; i < Rotate.names.Length; i++)
        {
            GameObject newButton = Instantiate(buttonPrefab);
            newButton.name = Rotate.names[i];
            newButton.transform.SetParent(parent.transform, false);
            buttons[i] = newButton.GetComponent<Button>();
            buttons[i].onClick.AddListener(() => ButtonClicked(i));
        }
    }

    void ButtonClicked(int buttonNo)
    {
        Debug.Log("Clicked On " + buttons[buttonNo]);
    }

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

    }
}

我在行上遇到异常：

Debug.Log("Clicked On " + buttons[buttonNo]);

IndexOutOfRangeException：索引超出了数组的范围

我想做的是，当我单击其中一个按钮时，它将在ButtonClicked内执行相同的操作。

Answer 1

这是一个闭包问题，请不要使用循环值创建闭包，而是先将值分配给另一个局部变量。

for (int i = 0; i < Rotate.names.Length; i++)
{
    ...
    int j = i;
    buttons[i].onClick.AddListener(() => ButtonClicked(j));
}

如何在点击侦听器事件中添加脚本创建的每个按钮？

1 个答案: