egret 不同类之间相互调用以及事件侦听

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/sun124608666/article/details/84396458

Main类

class Main extends eui.Component {
    public constructor()
    {
        super();
    }

    public childrenCreated()
    {
        super.childrenCreated();
        this.callEvent();
    }

    //调用ScreenEvent类的函数
    private callEvent()
    {
        //调用ScreenEvent下的screen_1函数，不添加事件侦听
        ScreenEvent.getInstance().screen_1();

        //调用ScreenEvent下的screen_2函数(通过注册"SCREEN_COMPLETE"监听)，添加事件侦听
        let a:ScreenEvent = new ScreenEvent();
        a.addEventListener("SCREEN_COMPLETE",this.screenComplete,this);
        a.screen_2();
        //a.addEventListener 和 a.screen_2(); 一定不要写反，否则监听不到
    }

    private screenComplete(evt:ScreenEvent){
        //通过evt['data']来提取监听事件传来的值
        console.log(evt['data']);
    }
}

ScreenEvent类

class ScreenEvent extends egret.EventDispatcher{
    //单例，通过此可不声明类，直接调用（调用1）ScreenEvent.getInstance().screen_1();
    private static instance:ScreenEvent;
    public static getInstance():ScreenEvent{
        if(this.instance == null){
	    this.instance = new ScreenEvent();
	}
	    return this.instance;
    }

    public screen_1(){
        console.log('调用方式-1');
    }

    //第2种调用方式，通过写的"SCREEN_COMPLETE"在main中监听次函数的执行
    public screen_2(){
        let dataArr:any = {};
        for(let i=0;i<10;i++){
            dataArr[i] = i+7;
        }
        this.dispatchEvent(new egret.Event("SCREEN_COMPLETE", false, false, dataArr));
    }
}