Error: Uncaught (in promise): Error: StaticInjectorError[NavController]
By default you can’t use navController or viewController or anything like that in a Controller or a service.
Code:


An easier solution,
By default you can’t use navController or viewController or anything like that in a Controller or a service.
Code:


An easier solution,
import { HttpClient } from '@angular/common/http'; import { Injectable } from '@angular/core'; import { NavController, AlertController, App } from 'ionic-angular'; import {LoginPage} from "../pages/login/login"; @Injectable() export class CommonProvider { public session:any; constructor( public http: HttpClient, public alertCtrl: AlertController, public appCtrl : App ) {} public getSession() { let activeNav: NavController = this.appCtrl.getActiveNav(); this.session = window.localStorage.getItem('session'); if(!this.session) { activeNav.setRoot(LoginPage); return false; } return this.session; }
Reference: https://www.cnblogs.com/wupeng88/p/8340947.html