半模态转场来实现弹框样式的页面

import relationalStore from '@ohos.data.relationalStore'; 
import ItemBean from './ItemBean'; 
import { ValuesBucket } from '@ohos.data.ValuesBucket'; 
 
export default class RdbTest { 
  //  rdbStore:relationalStore.RdbStore = undefined; 
 
  rdbStore?: relationalStore.RdbStore; 
  context: Context = getContext(this); 
  //  dataSet:relationalStore.ResultSet = undefined; 
  dataSet?: relationalStore.ResultSet; 
  dbSet: Array<ItemBean> = []; 
  sum: number = 0.0 
  i: number = 0.0 
 
  MyGetRdbStore() { 
 
    interface StoreConfig { 
      name: string; 
      securityLevel: relationalStore.SecurityLevel; 
    } 
 
    const STORE_CONFIG: StoreConfig = { 
      name: 'RdbTest.db', 
      securityLevel: relationalStore.SecurityLevel.S1 
    }; 
 
 
    relationalStore.getRdbStore(this.context, STORE_CONFIG, (err, store) => { 
      if (err) { 
        console.error(`Failed to get RdbStore. Code:${err.code}, message:${err.message}`); 
        return; 
      } else { 
        console.info(`成功获取 RdbStore.`); 
      } 
      this.rdbStore = store; 
      this.CreateTable(); 
    } 
 
    ) 
 
 
  } 
 
  Average() { 
    let predicates = new relationalStore.RdbPredicates('EMPLOYEE'); 
    predicates.inAllDevices(); 
    if (this.rdbStore != undefined) { 
      this.rdbStore.query(predicates, ['ID', 'NAME'], (err, resultSet) => { 
        if (err) { 
          console.error(`Failed to query data. Code:${err.code}, message:${err.message}`); 
          return; 
        } 
        console.info(`ResultSet column names: ${resultSet.columnNames}, column count: ${resultSet.columnCount}`); 
        // resultSet是一个数据集合的游标，默认指向第-1个记录，有效的数据从0开始。 
        this.dbSet = []; 
        while (resultSet.goToNextRow()) { 
          const id = resultSet.getLong(resultSet.getColumnIndex("ID")); 
          const name = resultSet.getString(resultSet.getColumnIndex("NAME")); 
 
          const num = new Number(name).valueOf(); 
          this.sum = this.sum + num; 
          this.i++; 
        } 
        // 释放数据集的内存 
        this.sum = this.sum / this.i; 
        console.log("!!!" + this.sum); 
        this.dataSet = resultSet; 
        resultSet.close(); 
      }) 
    } 
  } 
 
  CreateTable() { 
    if (this.rdbStore != undefined) { 
 
      const SQL_CREATE_TABLE = 'CREATE TABLE IF NOT EXISTS EMPLOYEE (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT NOT NULL)'; 
      this.rdbStore.executeSql(SQL_CREATE_TABLE); 
      console.log("成功建表") 
    } 
  } 
 
  InsertData(name: number) { 
    // 插入数据 
 
 
    const valueBucket: ValuesBucket = { 
      'NAME': name 
    }; 
 
 
    if (this.rdbStore != undefined) { 
 
      this.rdbStore.insert('EMPLOYEE', valueBucket, (err, rowId) => { 
        if (err) { 
          console.error(`Failed to insert data. Code:${err.code}, message:${err.message}`); 
          return; 
        } 
        console.info(`Succeeded in inserting data. rowId:${rowId}`); 
      }) 
    } 
 
  } 
}