npmchenwei111/app/manager/EventEmitterManager.js

test1111

/**
 * Created by chenwei on 2017/7/15.
 */

import React from 'react'
import { DeviceEventEmitter } from 'react-native'

class EventEmitterManager {

  emitterMap = {}

  /**
   * 获取screen的广播接收器
   * @param screen
   * @returns {EventEmitterManager|undefined|*}
   */
  static get (screen) {
    EventEmitterManager.lose(screen)
    if (!screen.hasEventEmitter) {
      screen.hasEventEmitter = new EventEmitterManager()
    }
    return screen.hasEventEmitter
  }

  /**
   * 释放screen内的广播接收器
   * @param screen
   */
  static lose (screen) {
    if (screen.hasEventEmitter && typeof screen.hasEventEmitter.removeAllEventEmitter === 'function') {
      screen.hasEventEmitter.removeAllEventEmitter()
      screen.hasEventEmitter = undefined
    }
  }

  addEventEmitter (name, event) {
    if (this.emitterMap[name]) {
      this.emitterMap[name].remove()
    }
    this.emitterMap[name] = DeviceEventEmitter.addListener(name, event)
    return this
  }

  removeAllEventEmitter () {
    if (this.emitterMap) {
      for (let key in this.emitterMap) {
        if (this.emitterMap[key]) {
          this.emitterMap[key].remove()
        }
      }
      this.emitterMap = {}
    }
  }

}

export default EventEmitterManager