没有 NavController 的提供者！离子 3 [英] No provider for NavController! Ionic 3

问题描述

我将 Ionic3 用于我的大学项目，我添加了 app.html 的设置部分并尝试链接 (click)="home()" 但它对我不起作用.

出现以下错误

<块引用>

错误:NavController 没有提供程序！at injectionError (http://localhost:8100/build/vendor.js:1527:90)在 noProviderError (http://localhost:8100/build/vendor.js:1565:12)在 ReflectiveInjector_.throwOrNull (http://localhost:8100/build/vendor.js:3007:19)在 ReflectiveInjector.getByKeyDefault (http://localhost:8100/build/vendor.js:3046:25)在 ReflectiveInjector.getByKey (http://localhost:8100/build/vendor.js:2978:25)在 ReflectiveInjector.get (http://localhost:8100/build/vendor.js:2847:21)在 resolveNgModuleDep (http://localhost:8100/build/vendor.js:9847:25)在 NgModuleRef_.get (http://localhost:8100/build/vendor.js:10935:16)在 resolveDep (http://localhost:8100/build/vendor.js:11438:45)在 createClass (http://localhost:8100/build/vendor.js:11302:32)

app.html

<!--------------------------------------主导航---------------------------><ion-menu id="myMenu" [content]="content" side="right" persistent="true" [class]="selectedTheme"><离子头><离子工具栏><离子网格><离子行><ion-col col-6><div text-left style="" class="app-listname">项目

</ion-col><ion-col (click)="home()"><div class="tether-setting" style="text-align: right;font-size: 2rem; color:#a57958;"><ion-icon ios="ios-settings-outline" md="md-settings"></ion-icon>

</ion-col><ion-col><div class="tether-logout" style="font-size: 2rem; color:#a57958; text-indent: 0rem; text-align: right;"><ion-icon ios="ios-log-out" md="md-log-out"></ion-icon>

</ion-col></ion-row></离子网格></ion-toolbar></ion-header><离子含量><div class="ion-tm"><离子列表><button menuClose ion-item *ngFor="let p of pages" [class.activeHighlight]="checkActive(p)" (click)="openPage(p)"><ion-icon [name]="p.icon" item-left></ion-icon>{{p.title}}</button></ion-list>

</离子含量></ion-menu><ion-nav [root]="rootPage" #content swipeBackEnabled="false" [class]="selectedTheme"></ion-nav><!--------------------------------------主导航--------------------------->

app.component.ts

 import {Component, ViewChild} from '@angular/core';从'ionic-angular'导入{Nav, Platform,NavController}；从@ionic-native/status-bar"导入 {StatusBar}；从@ionic-native/splash-screen"导入 {SplashScreen}；从 '../pages/home/home' 导入 {HomePage}；从../pages/settings/settings"导入{SettingsPage}；从../pages/help/help"导入{HelpPage}；从../pages/userloginslide/userloginslide"导入{UserloginslidePage}；从../providers/settings/settings"导入{SettingsProvider}；从../pages/modal/modal"导入{ModalPage}；@零件({模板网址:'app.html'})导出类 MyApp {@ViewChild(Nav) 导航:导航；rootPage: any = UserloginPage;selectedTheme:字符串；//主题选项活动页面:任何；页面:数组<{标题:字符串，组件:任何，图标:字符串}>;构造函数(平台:平台，状态栏:状态栏，飞溅屏幕:SplashScreen，私有设置:SettingsProvider，私有导航控件:导航控制器){this.settings.getActiveTheme().subscribe(val => this.selectedTheme = val);//主题选项platform.ready().then(() => {statusBar.styleDefault();splashScreen.hide();});platform.ready().then(() => {//好的，所以平台已经准备好了，我们的插件也可用了.//在这里，您可以执行您可能需要的任何更高级别的本机操作.statusBar.styleDefault();splashScreen.hide();});this.pages = [{title: 'Dashboard', component: HomePage, icon: "ios-home-outline"},{title: '设置', 组件: SettingsPage, icon: "ios-settings-outline"},{title: 'Help', component: HelpPage, icon: "ios-help-circle-outline"},{title: '用户登录幻灯片', 组件:UserloginslidePage, icon: "ios-contact-outline"},];this.activepage = this.pages[0];}//主题选项打开页面(页面){this.nav.setRoot(page.component);this.activepage = 页面；}检查活动(页面){返回页面 == this.activepage;}家(){this.navCtrl.push(HomePage);}}

解决方案

那么，为什么要尝试导入 NavController?你有 @ViewChild(Nav) nav: Nav; 你可以使用它.

您必须从构造函数中的注入中删除NavController

更换您的线路

constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen,private settings: SettingsProvider,private navCtrl: NavController) {

与

constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen,private settings: SettingsProvider) {

然后替换该行

 this.navCtrl.push(HomePage);

与

 this.nav.push(HomePage);

I'm Using Ionic3 for my university project , I had added setting parts of my app.html and trying to link (click)="home()" but it's not working for me.

I got following error

Error: No provider for NavController! at injectionError (http://localhost:8100/build/vendor.js:1527:90) at noProviderError (http://localhost:8100/build/vendor.js:1565:12) at ReflectiveInjector_.throwOrNull (http://localhost:8100/build/vendor.js:3007:19) at ReflectiveInjector.getByKeyDefault (http://localhost:8100/build/vendor.js:3046:25) at ReflectiveInjector.getByKey (http://localhost:8100/build/vendor.js:2978:25) at ReflectiveInjector.get (http://localhost:8100/build/vendor.js:2847:21) at resolveNgModuleDep (http://localhost:8100/build/vendor.js:9847:25) at NgModuleRef_.get (http://localhost:8100/build/vendor.js:10935:16) at resolveDep (http://localhost:8100/build/vendor.js:11438:45) at createClass (http://localhost:8100/build/vendor.js:11302:32)

app.html

<!--------------------------------------Main Navigation--------------------------->

<ion-menu id="myMenu" [content]="content" side="right" persistent="true" [class]="selectedTheme">
  <ion-header>
    <ion-toolbar>
      <ion-grid>

        <ion-row>
          <ion-col col-6>
            <div text-left style="" class="app-listname">
              Project</div>
          </ion-col>
          <ion-col  (click)="home()">
            <div class="tether-setting" style="text-align: right;font-size: 2rem; color:#a57958;">
              <ion-icon ios="ios-settings-outline" md="md-settings"></ion-icon>
            </div>

          </ion-col>
          <ion-col>
            <div class="tether-logout" style="font-size: 2rem; color:#a57958; text-indent: 0rem;  text-align: right;">
              <ion-icon ios="ios-log-out" md="md-log-out"></ion-icon>
            </div>
          </ion-col>
        </ion-row>
      </ion-grid>

    </ion-toolbar>
  </ion-header>

  <ion-content>
    <div class="ion-tm">
      <ion-list>
        <button menuClose ion-item *ngFor="let p of pages" [class.activeHighlight]="checkActive(p)" (click)="openPage(p)">
          <ion-icon [name]="p.icon" item-left></ion-icon>{{p.title}}</button>

      </ion-list>
    </div>
  </ion-content>

</ion-menu>
<ion-nav [root]="rootPage" #content swipeBackEnabled="false" [class]="selectedTheme"></ion-nav>
<!--------------------------------------Main Navigation--------------------------->

app.component.ts

   import {Component, ViewChild} from '@angular/core';
import {Nav, Platform,NavController} from 'ionic-angular';
import {StatusBar} from '@ionic-native/status-bar';
import {SplashScreen} from '@ionic-native/splash-screen';

import {HomePage} from '../pages/home/home';

import {SettingsPage} from "../pages/settings/settings";
import {HelpPage} from "../pages/help/help";

import {UserloginslidePage} from "../pages/userloginslide/userloginslide";
import {SettingsProvider} from "../providers/settings/settings";
import {ModalPage} from "../pages/modal/modal";
@Component({
  templateUrl: 'app.html'
})
export class MyApp {

  @ViewChild(Nav) nav: Nav;
  rootPage: any = UserloginPage;
  selectedTheme: String;  //Themeoption
  activepage: any;
  pages: Array<{ title: string, component: any, icon: string }>;

  constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen,private settings: SettingsProvider,private navCtrl: NavController) {
    this.settings.getActiveTheme().subscribe(val => this.selectedTheme = val);  //Themeoption

    platform.ready().then(() => {
      statusBar.styleDefault();
      splashScreen.hide();
    });


    platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      statusBar.styleDefault();
      splashScreen.hide();
    });


    this.pages = [

      {title: 'Dashboard', component: HomePage, icon: "ios-home-outline"},

      {title: 'Settings', component: SettingsPage, icon: "ios-settings-outline"},
      {title: 'Help', component: HelpPage, icon: "ios-help-circle-outline"},
      {title: '  User loginslide ', component:UserloginslidePage, icon: "ios-contact-outline"},


    ];

    this.activepage = this.pages[0];
  }


  //Themeoption
  openPage(page) {


    this.nav.setRoot(page.component);
    this.activepage = page;

  }
  checkActive(page) {
    return page == this.activepage;
  }

  home(){
    this.navCtrl.push(HomePage);
  }
}

解决方案

Well, why do you try to import NavController? You have @ViewChild(Nav) nav: Nav; you can use it.

You must remove NavController from injecting in your constructor

Replace your line

constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen,private settings: SettingsProvider,private navCtrl: NavController) {

with

constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen,private settings: SettingsProvider) {

Then replace the line

 this.navCtrl.push(HomePage);

with

 this.nav.push(HomePage);

这篇关于没有 NavController 的提供者！离子 3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！