HarmonyOSBaseLibs/src/main/ets/utils/AppStorageHelper.ets

/**
 * 永久化存储，存储在本地文件
 */
export class AppStorageHelper {
  private constructor() {
  }
  /**
   * 缓存
   * @param key
   * @param value
   */
  public static save<T>(key: string, value: T | undefined) {
    if (value === undefined || value === null) {
      PersistentStorage.deleteProp(key)
    } else {
      PersistentStorage.persistProp(key, value)
    }
  }

  /**
   * 删除缓存
   * @param key
   * @param value
   */
  public static delete(key: string) {
    PersistentStorage.deleteProp(key)
  }

  /**
   * 获取已缓存的内容
   * @param key
   * @returns
   */
  public static get<T>(key: string): T | undefined {
    return AppStorage.get<T>(key)
  }
}