最近開發的時候，發現要用到設計模式中的觀察者模式，所以就找了一些資料來看看，然後自己結合Unity來實現了一下觀察者模式，

由於本人是初學者，寫的不好，望請指導。

首先，擺好如圖所示的UI的介面：

然後建立如下的指令碼：

1、Subject（這個指令碼是事件的派發類，所有發生的事件都由這個類來派發）

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

public  delegate void ObserverTest();

public class Subject : MonoBehaviour
{
    public static event ObserverTest ObserverTestEvent;


    void Start()
    {
        Button btn = transform.Find("Button").GetComponent<Button>();
        btn.onClick.AddListener(onClick);
    }

    public void onClick()
    {
        if (ObserverTestEvent != null)
            ObserverTestEvent();
    }

}
 

1、ButtonObserver.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ButtonObserver : MonoBehaviour
{
    void Start()
    {
        Subject.ObserverTestEvent += ChangeButton;
    }

    public void ChangeButton()
    {
        Button btn = transform.Find("Button1").GetComponent<Button>();
        Image image = btn.GetComponent<Image>();
        Text txt = btn.transform.Find("Text").GetComponent<Text>();

        image.color = Color.red;
        txt.text = "On Change Button Text";
    }

    void OnDestroy()
    {
        Subject.ObserverTestEvent -= ChangeButton;

    }
}
 

2、TextObserver_1

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class TextObserver_1 : MonoBehaviour {


	// Use this for initialization
	void Start () {
        Subject.ObserverTestEvent += ChangeText;
	}
	
    private void ChangeText()
    {
        Text txt = transform.Find("Text1").GetComponent<Text>();
        txt.text = "hi, Eagle1";
    }

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

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class TextOberver_2 : MonoBehaviour {

    // Use this for initialization
    void Start()
    {
        Subject.ObserverTestEvent += ChangeText;
    }

    private void ChangeText()
    {
        Text txt = transform.Find("Text2").GetComponent<Text>();
        txt.text = "hi, Eagle2";
    }


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

然後點選（圖中紅框的button），有如下效果：

所有指令碼都放在canvas上面