无法解析存储的所有参数：（？） [英] Can't resolve all parameters for Storage: (?)

问题描述

我从模态中获取值，我想在ionic2 angular2项目中使用本地存储来存储和获取它。我的代码如下。它出现以下错误：

I am getting values from a modal and I want to store and get it using local storage in ionic2 angular2 project. My code is given below. It gives following error:

在 home.ts 页面，我已导入存储空间

In home.ts page, I have imported storage

import { Storage } from '@ionic/storage';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  providers :[
  Storage
]
})

export class HomePage {
 private DistanceUnit: string;
 private selectedRadious : number;

 constructor(public navCtrl: NavController
          public modalCtrl: ModalController,
          public storage: Storage) {


}

presentModal() {
this.storage.get('distUnit').then((val) => {
  console.log('Your distUnit is', val);
  this.DistanceUnit = val;     
})
.catch(err=>{
  console.log('Your distUnit dont exist: ' + JSON.stringify(err));
  this.DistanceUnit = 'Meters';
});

 this.storage.get('SetRadious').then((val) => {
  console.log('Your SetRadious is', val);
  this.selectedRadious = val;
})
 .catch(err=>{
  console.log('Your SetRadious dont exist: ' + JSON.stringify(err));
    this.selectedRadious = 500;
});


let obj = {selectedRadious: this.selectedRadious, DistanceUnit: this.DistanceUnit};
let myModal = this.modalCtrl.create(SettingModalPage, obj);

myModal.onDidDismiss(data => {
  console.log('modal value: '+data.DistanceUnit)
  this.DistanceUnit = data.DistanceUnit;
  this.selectedRadious = data.selectedRadious;

 this.storage.set('distUnit', this.DistanceUnit);
 this.storage.set('SetRadious', this.selectedRadious);
});

myModal.present();
}
}

在 app.module中。 ts file，

import { NgModule, ErrorHandler } from '@angular/core';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { HttpModule } from '@angular/http';
import { Storage } from '@ionic/storage';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { DetailsPage } from '../pages/details/details';

import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';
import { TypeApi } from '../shared/shared';
import { PlaceDetailService } from '../shared/shared';
import { LaunchNavigator, LaunchNavigatorOptions } from '@ionic- native/launch-navigator';
import { SettingModalPage } from '../pages/setting-modal/setting-modal';

@NgModule({
  declarations: [
  MyApp,
  HomePage,
  DetailsPage,
  SettingModalPage

],
imports: [
  IonicModule.forRoot(MyApp),
  HttpModule
],
bootstrap: [IonicApp],
  entryComponents: [
  MyApp,
  HomePage,
  DetailsPage,
  SettingModalPage
],
providers: [
  Storage,
  TypeApi,
  PlaceDetailService,
  LaunchNavigator,
  StatusBar,
  SplashScreen,
  {provide: ErrorHandler, useClass: IonicErrorHandler}
]
})
export class AppModule {}

推荐答案

来自 @离子/存储版本 - 2.0.0 ，
进行以下更改：

From @ionic/storage version - 2.0.0, make the below changes:

app.module.ts

import { IonicStorageModule } from '@ionic/storage';

//..
@ngModule({

imports: [
  IonicModule.forRoot(MyApp),
  HttpModule,
  IonicStorageModule.forRoot(),
]

注意：你需要从'@ ionic / storage'中删除 import {Storage};

检查发行说明这里

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