80 lines
1.9 KiB
Dart
80 lines
1.9 KiB
Dart
import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import '../models/region.dart';
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class RegionProvider extends ChangeNotifier {
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RegionProvider() {
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loadRegionData();
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}
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String _provinceName = '';
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String _cityName = '';
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String _tempProvinceName = '';
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String _tempCityName = '';
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String get provinceName => _provinceName;
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String get cityName => _cityName;
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String get tempProvinceName => _tempProvinceName;
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String get tempCityName => _tempCityName;
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final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
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loadRegionData() {
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_prefs.then((prefs) {
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if (prefs.getString('REGION') != null) {
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final region =
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RegionData.fromJson(jsonDecode(prefs.getString('REGION')));
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_provinceName = region.provinceName;
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_cityName = region.cityName;
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_tempProvinceName = region.provinceName;
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_tempCityName = region.cityName;
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notifyListeners();
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}
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});
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}
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updateRegion(pname, cname) {
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// _provinceName = pname;
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// _cityName = cname;
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_tempProvinceName = pname;
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_tempCityName = cname;
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notifyListeners();
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}
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//将临时变量保存到正式变量，并保存本地
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saveRegion() {
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_provinceName = _tempProvinceName;
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_cityName = _tempCityName;
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print(_tempCityName);
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final region = <String, dynamic>{
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"provinceName": _tempProvinceName,
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'cityName': _tempCityName
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};
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_prefs.then((prefs) {
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prefs.setString('REGION', jsonEncode(region));
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});
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notifyListeners();
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}
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// 覆盖临时的变量
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resetTemp() async {
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_tempProvinceName = _provinceName;
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_tempCityName = _cityName;
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notifyListeners();
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}
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// 将临时的省市名设为空
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clearTemp() {
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_tempProvinceName = '';
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_tempCityName = '';
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notifyListeners();
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}
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}
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