这是我使用ionic4的第一个应用程序,并且发生了一些奇怪的事情。当我点击任何链接时,会有延迟,并且整个背景会在加载页面之前闪烁。这是一个显示这种奇怪行为的视频:https://youtu.be/NqoOMQYyr4k
作为参考,以下是页面代码:
在 global.scss 上,我具有此属性来设置背景
ion-content {
--background: #000 url('./assets/images/main-bg.png') no-repeat center center / cover;
}
news.page.ts
import { News } from './news.model';
import { Component, OnInit } from '@angular/core';
import { NewsService } from '../services/news.service';
import { Router } from '@angular/router';
import { NavController } from '@ionic/angular';
@Component({
selector: 'app-news',
templateUrl: './news.page.html',
styleUrls: ['./news.page.scss'],
})
export class NewsPage implements OnInit {
news: any;
constructor(private newsService: NewsService, private router: Router, private navController: NavController) { }
ngOnInit() {
this.news = this.newsService.getAllEvents();
}
go(id: string) {
this.navController.navigateForward('news/' + id);
}
}
news.page.html
<ion-header>
<ion-toolbar color="grey">
<ion-buttons slot="start">
<ion-menu-button></ion-menu-button>
</ion-buttons>
<ion-title style="color: #524A4A!important">News</ion-title>
</ion-toolbar>
</ion-header>
<ion-content>
<ion-grid padding class="margin-logo-header">
<ion-row>
<div>
<h2>Noticias HD Friends</h2>
</div>
</ion-row>
</ion-grid>
<ion-card color="grey" *ngFor="let news of news | async">
<ion-nav-pop (click)="go(news.id)" >
<ion-img src="{{news.picture}}"></ion-img>
<ion-card-header>
<ion-card-title>{{ news.title }}</ion-card-title>
</ion-card-header>
<ion-card-content>
<p>{{ news.subtitle }}</p>
</ion-card-content>
</ion-nav-pop>
</ion-card>
</ion-content>
news.service.ts
import { Injectable } from '@angular/core';
import { AngularFireDatabase, AngularFireList } from '@angular/fire/database';
import { News } from '../news/news.model';
@Injectable({
providedIn: 'root'
})
export class NewsService {
NODE = 'news/';
news: AngularFireList<News[]>;
constructor(private db: AngularFireDatabase) { }
getAllEvents() {
const localNews = this.db.list(this.NODE);
return localNews.valueChanges();
}
getNews(id: string) {
return this.db.object(this.NODE + id);
}
}
这是一个错误,是因为它是一个Beta还是我搞砸了?
谢谢大家