在列表中设置活动的游戏对象-Java 学习之路

我'm making a menu for an Android 2d app, I have a bunch of UI panels in multiple menu' s当我按下右下角或左上角按钮时，脚本应该设置下一个面板激活并取消激活前一个面板，我认为列表应该有效 .

在Unity编辑器中，我将大小设置为4并将4个面板拖到脚本中，我收到此错误：

ArgumentOutOfRangeException：参数超出范围 . 参数名称：index

以下是脚本的相关部分：

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

public class MenuControl : MonoBehaviour
{
    //Buttons
    public GameObject ShipUpgradeRight;
    public GameObject ShipUpgradeLeft;

    //Ships
    private int shipUpgradeSelected = 0;
    List<GameObject> ShipList = new List<GameObject>();

    public void Keyword (string keyword)
    {
        if (keyword == "ShipUpgradeLeft") {
            shipUpgradeSelected--;
            ShipList[shipUpgradeSelected].SetActive (true);
            ShipList[shipUpgradeSelected+1].SetActive (false);
        }

        if (keyword == "ShipUpgradeRight") {
            shipUpgradeSelected--;
            CheckShip ();
            ShipList[shipUpgradeSelected].SetActive (true);
            ShipList[shipUpgradeSelected-1].SetActive (false);
        }   
    }
}

2 回答

根据您的评论和实际问题，我看到一个可能的问题 .

shipUpgradeSelected 的值永远不会增加 . 此外， shipUpgradeSelected 的初始值为零 .

public void Keyword (string keyword)
{
    if (keyword == "ShipUpgradeLeft") {
        shipUpgradeSelected--;
        ShipList[shipUpgradeSelected].SetActive (true);
        ShipList[shipUpgradeSelected+1].SetActive (false);
    }

    if (keyword == "ShipUpgradeRight") {
        shipUpgradeSelected--;
        CheckShip ();
        ShipList[shipUpgradeSelected].SetActive (true);
        ShipList[shipUpgradeSelected-1].SetActive (false);
    }   
}

当 keyword 等于 ShipUpgradeRight 或 ShipUpgradeLeft 时， shipUpgradeSelected 的值减小（因此它小于零） . 然后，您尝试访问索引小于零的列表项 .

但这是第一个问题 .

你也 shipUpgradeSelected 的 Value 't clamp (or don' . 例如，你有

if (keyword == "ShipUpgradeRight") {
    shipUpgradeSelected++;
    CheckShip ();
    ShipList[shipUpgradeSelected].SetActive (true);
    ShipList[shipUpgradeSelected-1].SetActive (false);
}

如果调用 Keyword("ShipUpgradeRight"); 五次（例如），则 shipUpgradeSelected 的值为5.并且它再次超出范围 . 所以你需要决定如何限制这个变量的值 .

回复于 2024-04-25T00:10:57+08:00

这段代码很完美：

public void Keyword(string keyword) {
         if (keyword == "ShipUpgradeLeft") {
             shipUpgradeSelected--;
             if (shipUpgradeSelected < 0) {
                 shipUpgradeSelected = 0;
                 return;
             }

             ShipList[shipUpgradeSelected].SetActive(true);
             if (shipUpgradeSelected + 1 < ShipList.Count) ShipList[shipUpgradeSelected + 1].SetActive(false);
             else ShipList[0].SetActive(false);
         }
         if (keyword == "ShipUpgradeRight") {
             shipUpgradeSelected++;
             if (shipUpgradeSelected >= ShipList.Count) {
                 shipUpgradeSelected = ShipList.Count - 1;
                 return;
             }

             ShipList[shipUpgradeSelected].SetActive(true);
             if (shipUpgradeSelected > 0) ShipList[shipUpgradeSelected - 1].SetActive(false);
             else ShipList[ShipList.Count-1].SetActive(false);
         }
     }

但如果我重新开始，我会这样做：

private void Start()
 {
     ShipUpgradeLeft.GetComponent<Button>().onClick.AddListener(() => { Previous(); });
     ShipUpgradeRight.GetComponent<Button>().onClick.AddListener(() => { Next(); });
 }
 public void Next()
 {
     ShipList[shipUpgradeSelected].SetActive(false);
     shipUpgradeSelected = Mathf.Clamp(shipUpgradeSelected++, 0, ShipList.Count - 1);
     ShipList[shipUpgradeSelected].SetActive(true);
 }
 public void Previous()
 {
     ShipList[shipUpgradeSelected].SetActive(false);
     shipUpgradeSelected = Mathf.Clamp(shipUpgradeSelected--, 0, ShipList.Count - 1);
     ShipList[shipUpgradeSelected].SetActive(true);
 }

感谢walther和d12frosted帮助我解决问题

回复于 2024-04-25T00:10:57+08:00

在列表中设置活动的游戏对象

2 回答

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