鸿蒙emitter 订阅事件封装 EmitterUtils

适用于api11 和api12  废话不多说，直接上代码

import emitter from '@ohos.events.emitter';
import { StringUtils } from '@ohos/flutter_ohos';export  class EmitterUtils{/*** 发射字符串类型的* @param eventId* @param data*/public  static sendEvent(eventId:string,data:string=''){let eventData: emitter.EventData = {data: {"content": data,}};let options: emitter.Options = {priority: emitter.EventPriority.HIGH};emitter.emit(eventId, options, eventData);}/*** 发送一个object ，并将eventId 带过去* @param eventId* @param data*/public  static sendObjetEvent(eventId:string,data:object){let eventData: emitter.EventData = {data: {"content": data,"eventId":eventId}};let options: emitter.Options = {priority: emitter.EventPriority.HIGH};emitter.emit(eventId, options, eventData);}/*** 监听string* @param eventId* @param onReceive*/public static listenString(eventId:string,onReceive:(content:string)=>void){// 收到eventId为"eventId"的事件后执行回调函数emitter.on(eventId, (data:emitter.EventData) => {let content:string=data.data?.content;if(StringUtils.isNotEmpty(content)){onReceive(content)}});}/*** 监听对象* @param eventId* @param onReceive*/public static listen(eventId:string,onReceive:(data:emitter.EventData)=>void){// 收到eventId为"eventId"的事件后执行回调函数emitter.on(eventId, (data:emitter.EventData) => {onReceive(data)});}/*** 取消eventID的所有事件回调处理函数* @param ventId*/public  static  closeEvent(ventId:string){emitter.off(ventId);}}

发送字符类型

EmitterUtils.sendEvent(EmitterIdConstants.TAB_DASHBOARD_NO_TITLE_DATA,"noTitle")

接收字符串类型

EmitterUtils.listenString(EmitterIdConstants.TAB_DASHBOARD_NO_TITLE_DATA, (content: string) => {if (StringUtils.isNotEmpty(content)) {//...todo...}})

发送对象类型

let data= await this.fetchKnowledgeTitles();
let map = new Map<string, object>();
map.set("titleList", data ? data.result || [] : []);
EmitterUtils.sendObjetEvent(EmitterIdConstants.GET_TITLE_LIST,map)

接收对象类型

EmitterUtils.listen(EmitterIdConstants.GET_TITLE_LIST, (data: emitter.EventData) => {if (data.data != null){try {let map = data.data?.content as Map<string, Object>} catch (e) {}}})

销毁这个订阅

 aboutToDisappear(): void {EmitterUtils.closeEvent(EmitterIdConstants.ON_HOME_TAB_CLICK)}

上面 EmitterIdConstants 是你起的事件常量名字

export class EmitterIdConstants{static readonly ON_HOME_TAB_CLICK = 'home_tab_click';static readonly GET_TITLE_LIST = 'get_title_list'; //title List........
}