@td-design/react-native/lib/module/portal/PortalGuard.js

react-native UI组件库

import { DeviceEventEmitter, NativeEventEmitter } from 'react-native';

// 事件名
export const ADD_TYPE = 'TD_DESIGN_REACT_NATIVE_ADD_PORTAL';
export const REMOVE_TYPE = 'TD_DESIGN_REACT_NATIVE_REMOVE_PORTAL';

// 全局的监听事件
export const TopViewEventEmitter = DeviceEventEmitter || new NativeEventEmitter();
class PortalGuard {
  nextKey = 10000;
  add = e => {
    const key = this.nextKey++;
    // 发射监听事件
    TopViewEventEmitter.emit(ADD_TYPE, e, key);
    return key;
  };
  remove = key => TopViewEventEmitter.emit(REMOVE_TYPE, key);
}
export const portal = new PortalGuard();
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