[UGUI] Unity adds options to drop-down menus (DropDown)

If you want to control whoever you want, get it into the code - get the component - modify the component parameters (variables or methods)

Code example:

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

public class UIcontrol : MonoBehaviour
{
    // 演示组件控制
    //1.拿到整个游戏物体 2.拿到组件 3.获取用选中的数值
    GameObject obj;//类的变量，类的实例化对象
    private TMP_Dropdown OneDropdown;



    void Start()
    {
        //------------------获取下拉菜单+组件-----------------
        obj = GameObject.Find("Dropdown");//静态函数
        OneDropdown = obj.GetComponent<TMP_Dropdown>();//公共函数
        DropOptions();//修改选项内容
      
    }
    public void  DropOptions()
    {
        OneDropdown.options.Add(new TMP_Dropdown.OptionData("北京"));//添加一个选项
        OneDropdown.options.Add(new TMP_Dropdown.OptionData("洛阳"));//添加一个选项
        OneDropdown.options.Add(new TMP_Dropdown.OptionData("四川"));//添加一个选项

    }

    
}

     Core code: OneDropdown.options.Add(new TMP_Dropdown.OptionData("Sichuan"));//Add an option