Unity框架之事件的订阅和发布（观察者模式）

事件管理器

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

public class event_manager : Singletom<event_manager> {
    public delegate void on_event_handler(string name, object udata);
    
    private Dictionary<string, on_event_handler> event_listeners = new Dictionary<string,on_event_handler>();

    // 订阅者而言
    public void add_event_listener(string name, on_event_handler handler) {
        if (this.event_listeners.ContainsKey(name)) {
            this.event_listeners[name] += handler;
        }
        else {
            this.event_listeners.Add(name, handler);
        }
    }

    public void remove_event_listener(string name, on_event_handler handler) {
        if (!this.event_listeners.ContainsKey(name)) {
            return;
        }

        this.event_listeners[name] -= handler;
        if (this.event_listeners[name] == null) {
            this.event_listeners.Remove(name);
        }
    }
    // end 

    // 发布
    public void dispatch_event(string name, object udata) {
        if (!this.event_listeners.ContainsKey(name)) {
            return;
        }

        if (this.event_listeners[name] != null) {
            this.event_listeners[name](name, udata);
        }
    }
    // end 

}

使用

发布

event_manager.Instance.dispatch_event("coin", (object)100);

订阅

void on_coin_value(string name, object udata) {
    int coin = (int)udata;
    Debug.Log("coin = " + coin);
}
event_manager.Instance.add_event_listener("coin", this.on_coin_value);