爱奥尼亚2:Facebook登录->;错误:NavController中没有提供程序(TypeScript)
我一直在为我的爱奥尼亚2应用程序进行facebook登录 (使用本教程:) 但现在我发现了一个奇怪的错误: 0:0中的运行时错误,原因是:没有NavController的提供程序 app.component.ts:爱奥尼亚2:Facebook登录->;错误:NavController中没有提供程序(TypeScript),facebook,typescript,ionic2,facebook-apps,Facebook,Typescript,Ionic2,Facebook Apps,我一直在为我的爱奥尼亚2应用程序进行facebook登录 (使用本教程:) 但现在我发现了一个奇怪的错误: 0:0中的运行时错误,原因是:没有NavController的提供程序 app.component.ts: import { Component } from '@angular/core'; import { Platform } from 'ionic-angular'; import { StatusBar } from '@ionic-native/status-bar';
import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';
import { NativeStorage } from '@ionic-native/native-storage';
import { TabsPage } from '../pages/tabs/tabs';
import { WelcomePage } from '../pages/welcome/welcome';
import { DetailPage } from '../pages/detail/detail';
@Component({
templateUrl: 'app.html'
})
export class MyApp {
rootPage: any = WelcomePage;
constructor(NativeStorage: NativeStorage, platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen) {
platform.ready().then(() => {
// Here we will check if the user is already logged in
// because we don't want to ask users to log in each time they open the app
let env = this;
NativeStorage.getItem('user')
.then((data) => {
// user is previously logged and we have his data
// we will let him access the app
this.rootPage = DetailPage;
splashScreen.hide();
}, (error) => {
//we don't have the user data so we will ask him to log in
this.rootPage = WelcomePage;
splashScreen.hide();
});
statusBar.styleDefault();
});
}
}
欢迎光临
import { Component } from '@angular/core';
import { Facebook, NativeStorage } from 'ionic-native';
import { NavController } from 'ionic-angular';
import { DetailPage } from '../detail/detail';
import { ViewChild } from '@angular/core';
@Component({
selector: 'page-welcome',
templateUrl: 'welcome.html'
})
export class WelcomePage {
rootPage: any = WelcomePage;
@ViewChild('navRoot') navCtrl: NavController;
FB_APP_ID: number = 123456789;
constructor() {
Facebook.browserInit(this.FB_APP_ID, "v2.8");
}
doFbLogin() {
let permissions = new Array();
let nav = this.navCtrl;
//the permissions your facebook app needs from the user
permissions = ["public_profile"];
Facebook.login(permissions)
.then(function (response) {
let userId = response.authResponse.userID;
let params = new Array();
//Getting name and gender properties
Facebook.api("/me?fields=name,gender", params)
.then(function (user) {
user.picture = "https://graph.facebook.com/" + userId + "/picture?type=large";
//now we have the users info, let's save it in the NativeStorage
NativeStorage.setItem('user',
{
name: user.name,
gender: user.gender,
picture: user.picture
})
.then(function () {
nav.push(DetailPage);
}, function (error) {
console.log(error);
})
})
}, function (error) {
console.log(error);
});
}
}
无法在
app.component.ts
或根应用程序页面中导入NavController
选项1:
尝试使用ViewChild
为根导航提供元素id
<ion-nav #navRoot [root]="rootPage"></ion-nav>
选项2:
从app.component.ts代码中,如果html模板仅包含
<ion-nav [root]="rootPage"></ion-nav>
旁注:最好使用
()=>{}
箭头函数进行回调,而不是将上下文保存在第二个变量中。感谢您的回复,但错误仍然存在。我从'@angular/core'添加了import{ViewChild};rootPage:any=WelcomePage@ViewChild('navRoot')navCtrl:NavController;为了welcome.ts和changed,您是否从构造函数参数中删除了navcontroller?是的,但是代码的其余部分不再工作。我应该把我以前在app.components.ts中的代码放在哪里?你是说第二个选项吗?看起来像是输入错误:NativeStorage:NativeStorage
更改变量名。。您已将其设置为类名
<ion-nav [root]="rootPage"></ion-nav>
nativeStorage.getItem('user')
.then( (data) => {
// user is previously logged and we have his data
// we will let him access the app
this.rootPage = DetailPage;
splashScreen.hide();
}, (error) => {
//we don't have the user data so we will ask him to log in
this.rootPage = WelcomePage;
splashScreen.hide();
});