yichael_smartbow/Assets/BowArrow/Scripts/View/ShopView.cs

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

public class ShopView : MonoBehaviour
{
    [SerializeField] Sprite[] optionSprites;
    [SerializeField] GameObject options;

    void Start() {
        InitOptions();
    }

    void InitOptions() {
        for (int i = 0; i < this.options.transform.childCount; i++) {
            int index = i;
            Button button = this.options.transform.GetChild(i).gameObject.AddComponent<Button>();
            button.onClick.AddListener(delegate() {
                this.SelectOption(index);
            });
        }
        SelectOption(1);
    }

    void SelectOption(int index) {
        for (int i = 0; i < this.options.transform.childCount; i++) {
            this.options.transform.GetChild(i).GetComponent<Image>().sprite = this.optionSprites[0];
        }
        this.options.transform.GetChild(index).GetComponent<Image>().sprite = this.optionSprites[1];
    }

    public void Back() {
        AudioMgr.ins.PlayBtn();
        Destroy(this.gameObject);
    }
}