TrafficRoad/Assets/BuildSystem/Scripts/UI/GridUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
namespace BuildSystem
{
    [RequireComponent(typeof(Image),typeof(Button))]
    public class GridUI : MonoBehaviour
    {
        [Header("scriptsObject数据 上右下左")]
        public PlaceObject_SO[] placeObject_SO;
        int dataIndex;
        [Header("切换")]
        public Button switchBtn;
        [Header("四向图 上右下左放置")]
        public Sprite[] sprites;
        int index = 0;
        [Header("组件")]
        Image image;
        Button btn;
        private void Awake()
        {
            btn = GetComponent<Button>();
            image = GetComponent<Image>();
            image.sprite = sprites[index];
            btn.onClick.AddListener(()=> {
                BuildSystemManager.Instance.ChangeChoose(placeObject_SO[dataIndex]);
            });

            switchBtn.onClick.AddListener(()=> {
                IndexChange(1);
                image.sprite = sprites[index];
                BuildSystemManager.Instance.ChangeChoose(placeObject_SO[dataIndex]);
            });
        }

        void IndexChange(int value) {
            index += value;
            dataIndex += value;
            if (index > sprites.Length - 1) {
                index = 0;
            } else if (index < 0) {
                index = sprites.Length - 1;
            }

            if (dataIndex > placeObject_SO.Length - 1)
            {
                dataIndex = 0;
            }
            else if (dataIndex < 0)
            {
                dataIndex = placeObject_SO.Length - 1;
            }
        }

    }
}