1.unity 目錄結構如下：

2. canvas 下掛如下四個指令碼

Subject.cs

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


/// <summary>
/// 事件派發類，所有發生的事件都是由這個類來派發的
/// </summary>
/// 
public class Subject : MonoBehaviour {

    public delegate void ObserverTest();
    public static event ObserverTest ObserverTestEvent;

    private void Start()
    {
        Button btn = transform.Find("Button").GetComponent<Button>();
        btn.onClick.AddListener(OnClick);
    }
    public void OnClick(){
        if (ObserverTestEvent != null)
        {
            ObserverTestEvent();
        }
    }
}
 

ButtonObserver.cs

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

public class ButtonObserver : MonoBehaviour {

	// Use this for initialization
	void Start () {
        // 註冊事件
        Subject.ObserverTestEvent += ChangeButton; 
	}
	
    public void ChangeButton(){
        Button button = transform.Find("Button (1)").GetComponent<Button>();
        Image image = button.GetComponent<Image>();
        Text text = button.GetComponentInChildren<Text>();
        image.color = Color.yellow;
        text.text = "On Change Button Color";
    }
    private void OnDestroy()
    {
        // 結束時登出事件
        Subject.ObserverTestEvent -= ChangeButton;
    }
}
 

TextObserver_1.cs

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

public class TextObserver_1 : MonoBehaviour {

	// Use this for initialization
	void Start () {
        Subject.ObserverTestEvent += ChangeText;
	}
	
    /// <summary>
    /// 改變文字內容
    /// </summary>
    public void ChangeText(){
        Text text = transform.Find("Text").GetComponent<Text>();
        text.text = "Hi,第一個李勝福";
    }


    private void OnDestroy()
    {
        Subject.ObserverTestEvent -= ChangeText;
    }
}
 

TextOberver_2.cs

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

public class TextOberver_2 : MonoBehaviour {

	// Use this for initialization
	void Start () {
        Subject.ObserverTestEvent += ChangeText;
	}
	
    /// <summary>
    /// 改變第二個文字的內容
    /// </summary>
    void ChangeText(){
        Text text =  transform.Find("Text (1)").GetComponent<Text>();
        text.text = "Hi,第二個李勝福";
    }

    private void OnDestroy()
    {
        Subject.ObserverTestEvent -= ChangeText;
    }
}

3.效果圖如下：