ドラクエ風 簡単な名前入力システムを作る

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

public class Letter : MonoBehaviour
{
    [SerializeField] GameObject arrow;
    Text letter;
    void Start()
    {
        letter = GetComponent();
    }

    public void Selected(bool _selected)
    {
        if (_selected)
        {
            arrow.SetActive(true);
        }
        else
        {
            arrow.SetActive(false);
        }
    }

    public void SetLetter(string _letter)
    {
        letter.text = _letter;
    }

    public string SelectLetter()
    {
        return letter.text;
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class LetterPanel : MonoBehaviour
{
    [SerializeField] Letter letter;
    [SerializeField] TextAsset letterText;
    [SerializeField] Text nameText;

    List letters;
    int maxNameLength = 8;
    int currentIndex = 0;
    string myName = "";
    
    void Start()
    {
        
    }
    void Update()
    {
        
    }
}

あ,い,う,え,お,か,き,く,け,こ
さ,し,す,せ,そ,た,ち,つ,て,と
な,に,ぬ,ね,の,は,ひ,ふ,へ,ほ
ま,み,む,め,も,や,ゆ,よ
ら,り,る,れ,ろ,わ,を,ん

    void Start()
    {
        string[] letterLines = letterText.text.Split(new[] { '\n', '\r' }, System.StringSplitOptions.RemoveEmptyEntries);
        foreach (string letterLine in letterLines)
        {
            string[] letterValues = letterLine.Split(new char[] { ',' });
            foreach (string l in letterValues)
            {
                Debug.Log(l);
            }
        }
    }

    void Start()
    {
        //追加　Listを初期化
        letters = new List();
        
        string[] letterLines = letterText.text.Split(new[] { '\n', '\r' }, System.StringSplitOptions.RemoveEmptyEntries);
        foreach (string letterLine in letterLines)
        {
            string[] letterValues = letterLine.Split(new char[] { ',' });
            foreach (string l in letterValues)
            {    
                //追加
                Letter letterObj = Instantiate(letter, transform);
                letters.Add(letterObj);
                StartCoroutine(_setLetter(l, letterObj));
            }
        }
    }

    //追加
    IEnumerator _setLetter(string _l,Letter _letterObj)
    {
        yield return null;
        _letterObj.SetLetter(_l);
    }

  void Update()
    {
        
        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            currentIndex++;
        }
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            currentIndex--;
        }
        if (Input.GetKeyDown(KeyCode.DownArrow))
        {
            currentIndex += 10;
        }
        if (Input.GetKeyDown(KeyCode.UpArrow))
        {
            currentIndex -= 10;
        }
    }

  void Start()
    {
        /* 略 */
        ShowArrow();
    }

/* 略 */
    
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            currentIndex++;
            ShowArrow();
        }
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            currentIndex--;
            ShowArrow();
        }
        if (Input.GetKeyDown(KeyCode.DownArrow))
        {
            currentIndex += 10;
            ShowArrow();
        }
        if (Input.GetKeyDown(KeyCode.UpArrow))
        {
            currentIndex -= 10;
            ShowArrow();
        }
    }


    //追加
    void ShowArrow()
    {
        currentIndex = Mathf.Clamp(currentIndex, 0, letters.Count - 1);
        for (int i = 0; i < letters.Count; i++)
        {
            if (i == currentIndex)
            {
                letters[i].Selected(true);
            }
            else
            {
                letters[i].Selected(false);
            }
        }
    }

  void Update()
    {
        /*　略　*/
        if (Input.GetKeyDown(KeyCode.Space))
        {
            if (myName.Length < maxNameLength)
            {
                myName += letters[currentIndex].SelectLetter();
            }
            nameText.text = myName;
        }
    }

   void Update()
    {
        /* 略 */
        if (Input.GetKeyDown(KeyCode.Backspace))
        {
            if (myName.Length > 0)
            {
                myName = myName.Remove(myName.Length - 1);
            }
            nameText.text = myName;
        }
    }