前の投稿で説明したように、UIをツール上のドラッグアンドドロップに設定すると、プロジェクトの規模が大きいほど、欠点が多くなります.したがって,UIをコード上で自動化する必要がある.

unity設定

Define

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

public class Define 
{
    public enum UIEvent
    {
        Click,
        Drag,
    }

    public enum MouseEvent
    {
        Press,
        Click,
    }

    public enum CameraMode
    {
        Quarterview,
    }
}

Defineは、ユーザーインタフェースのクリックとドラッグを区別します.csにUIEventというenumを追加しました.

UI_Base

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

public class UI_Base : MonoBehaviour
{
    Dictionary<Type, UnityEngine.Object[]> _objects = new Dictionary<Type, UnityEngine.Object[]>();
    
    protected void Bind<T>(Type type) where T : UnityEngine.Object
    {
        string[] names = Enum.GetNames(type);

        UnityEngine.Object[] objects = new UnityEngine.Object[names.Length];
        _objects.Add(typeof(T), objects);

        for (int i = 0; i < names.Length; i++)
        {
            if (typeof(T) == typeof(GameObject))
                objects[i] = Util.FindChild(gameObject, names[i], true);
            else
                objects[i] = Util.FindChild<T>(gameObject, names[i], true);
        }
    }

    protected T Get<T>(int idx) where T : UnityEngine.Object
    {
        UnityEngine.Object[] objects = null;
        if (_objects.TryGetValue(typeof(T), out objects) == false)
            return null;

        return objects[idx] as T;
    }

    protected Text GetText(int idx) {return Get<Text>(idx);}
    protected Button GetButton(int idx) { return Get<Button>(idx); }
    protected Image GetImage(int idx) { return Get<Image>(idx); }

    public static void AddUIEvent(GameObject go, Action<PointerEventData> action, Define.UIEvent type = Define.UIEvent.Click)
    {
        UI_EventHandler evt = Util.GetOrAddComponent<UI_EventHandler>(go);

        switch (type)
        {
            case Define.UIEvent.Click:
                evt.OnClickHandler -= action;
                evt.OnClickHandler += action;
                break;
            case Define.UIEvent.Drag:
                evt.OnDragHandler -= action;
                evt.OnDragHandler += action;
                break;
        }
    }
}

Bind()でUI情報を保存しGet()で情報を取得する.
AddUIイベント()を使用してUIイベントを購読します.

UI_Button

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

public class UI_Button : UI_Base
{
    enum Buttons
    {
        PointButton,
    }

    enum Texts
    {
        PointText,
        ScoreText
    }

    enum GameObjects
    {
        TestObject,
    }

    enum Images
    {
        ItemIcon,
    }

    private void Start()
    {
        Bind<Button>(typeof(Buttons));
        Bind<Text>(typeof(Texts));
        Bind<GameObject>(typeof(GameObjects));
        Bind<Image>(typeof(Images));

        GetButton((int)Buttons.PointButton).gameObject.AddUIEvent(OnButtonClicked);

        GameObject go = GetImage((int)Images.ItemIcon).gameObject;        
        AddUIEvent(go, (PointerEventData data) => { go.transform.position = data.position; }, Define.UIEvent.Drag);
    }

    int _score = 0;

    public void OnButtonClicked(PointerEventData data)
    {
        _score++;
        GetText((int)Texts.ScoreText).text = $"점수: {_score}";
    }
}

メソッド機能を拡張して、PointButtonをクリックすると、OnButtonClicked()関数が実行されます.
また、ramda方式でItemIcon画像をドラッグすることもできます.

Util

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

public class Util
{
    public static T GetOrAddComponent<T>(GameObject go) where T : UnityEngine.Component
    {
        T component = go.GetComponent<T>();
        if (component == null)
            component = go.AddComponent<T>();
        return component;
    }

    public static GameObject FindChild(GameObject go, string name = null, bool recursive = false)
    {
        Transform transform = FindChild<Transform>(go, name, recursive);
        if (transform == null)
            return null;

        return transform.gameObject;
    }

    public static T FindChild<T>(GameObject go, string name = null, bool recursive = false) where T : UnityEngine.Object
    {
        if (go == null)
            return null;

        if (recursive == false)
        {
            for (int i = 0; i < go.transform.childCount; i++)
            {
                Transform transform = go.transform.GetChild(i);
                if (string.IsNullOrEmpty(name) || transform.name == name)
                {
                    T component = transform.GetComponent<T>();
                    if (component != null)
                        return component;
                }
            }
        }
        else
        {
            foreach (T component in go.GetComponentsInChildren<T>())
            {
                if (string.IsNullOrEmpty(name) || component.name == name)
                    return component;
            }
        }

        return null;
    }
}

FindChild()関数により、Bind()関数はUIを見つけることができます.
GameObjectを検索する場合、GameObjectは構成部品のフォーマットを持つことができないため、リロードによってバイナリを持たない関数も作成されます.
GetOrAddComponent()関数は、EventHandlerがない場合にイベントを処理するためのUIを追加するためのものです.EventHandlerとは限らず、Jennyを使用して他の構成部品を追加することもできます.

UI_EventHandler

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

public class UI_EventHandler : MonoBehaviour, IDragHandler, IPointerClickHandler
{
    public Action<PointerEventData> OnClickHandler = null;
    public Action<PointerEventData> OnDragHandler = null;
    public void OnPointerClick(PointerEventData eventData)
    {
        if (OnClickHandler != null)
            OnClickHandler.Invoke(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (OnDragHandler != null)
            OnDragHandler.Invoke(eventData);
    }
}

UIイベント処理に追加されたクラス.

Extension

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

public static class Extension
{
    public static void AddUIEvent(this GameObject go, Action<PointerEventData> action, Define.UIEvent type = Define.UIEvent.Click)
    {
        UI_Base.AddUIEvent(go, action, type);
    }
}

拡張メソッドを使用するために追加されたクラス.

ビデオの実装