/*
 * 数据持久化
 * */
class PreferencesUtil{
  prefMap: Map<string, preferences.Preferences> = new Map()
  async loadPreference(context, name: string){
    try {
      // 加载preferences
      let pref = await preferences.getPreferences(context, name)
      this.prefMap.set(name, pref)
      console.log('testTag', `加载Preferences[${name}]成功`)
    } catch (e) {
      console.log('testTag', `加载Preferences[${name}]失败`, JSON.stringify(e))
    }
  }

  async putPreferenceValue(name: string, key: string, value: preferences.ValueType){
    if (!this.prefMap.has(name)) {
      console.log('testTag', `Preferences[${name}]尚未初始化！`)
      return
    }
    try {
      let pref = this.prefMap.get(name)
      // 写入数据
      await pref.put(key, value)
      // 刷盘
      await pref.flush()
      console.log('testTag', `保存Preferences[${name}.${key} = ${value}]成功`)
    } catch (e) {
      console.log('testTag', `保存Preferences[${name}.${key} = ${value}]失败`, JSON.stringify(e))
    }
  }

  async getPreferenceValue(name: string, key: string, defaultValue: preferences.ValueType){
    if (!this.prefMap.has(name)) {
      console.log('testTag', `Preferences[${name}]尚未初始化！`)
      return
    }
    try {
      let pref = this.prefMap.get(name)
      // 读数据
      let value = await pref.get(key, defaultValue)
      console.log('testTag', `读取Preferences[${name}.${key} = ${value}]成功`)
      return value
    } catch (e) {
      console.log('testTag', `读取Preferences[${name}.${key} ]失败`, JSON.stringify(e))
    }
  }
}
const preferencesUtil = new PreferencesUtil()
export default preferencesUtil as PreferencesUtil

import preferencesUtil from '../Common/utils'

方法引用
await preferencesUtil.loadPreference(this.context, "club")
let firstInstall: string = await preferencesUtil.getPreferenceValue("club","firstInstall","0") as string

注意如果每次读取的都是默认值看一下是否设置了运行时保留App数据,见下图

截屏2024-06-12 15.47.48.png

截屏2024-06-07 14.34.01.png