Ionic 4事件在设备中不起作用，但在浏览器中起作用 [英] Ionic 4 Events not working in device but working on browser

问题描述

我正在使用"@ionic/angular": "^4.11.10"

我试图根据是否发出事件来显示ion-tab-bar中ion-tabs中的选项卡.我有一个*ngIf用于条件渲染.这是代码:

I'm trying to display the tabs in ion-tabs in ion-tab-bar depending on whether an event was emitted. I have an *ngIf for conditional rendering. Here's the code:

<ion-tabs color="danger">
    <ion-tab-bar class="tab-bar" slot="bottom">
        <ion-tab-button *ngIf="!registerClicked" tab="tab1">
            <ion-icon name="thumbs-up"></ion-icon>
            <ion-label>{{'Transfer' | translate}}</ion-label>
        </ion-tab-button>

        <ion-tab-button tab="tab2">
            <ion-icon name="gift"></ion-icon>
            <ion-label>{{'Perks' | translate}}</ion-label>
        </ion-tab-button>
    </ion-tab-bar>
<ion-tabs>

这是事件发射器:

import { Events } from '@ionic/angular';
export class LoginModalPage 
  constructor(
      public event:Events
    ) { }

  public login() {
      this.event.publish('registerClicked', false);
  }
}

类似地，还有另一个函数将registerClicked设置为true:

Similarly, there is another function that sets registerClicked to true:

import { Events } from '@ionic/angular';
export class RegisterModalPage 
  constructor(
      public event:Events
    ) { }

  public register() {
      this.event.publish('registerClicked', true);
  }
}

以及标签后面的代码

import { Events } from '@ionic/angular';
export class TabsPage {
  public registerClicked:boolean;
  constructor(
    public event: Events
  ) {
    this.event.subscribe('registerClicked', (data) =>{
      this.registerClicked = data;
    });
  }
}

现在，当我运行localhost:4200时，代码可以按预期工作，当单击按钮时调用登录功能时，将显示tab1，而当我单击执行register()功能的按钮时，该选项卡不可见.但是，当我构建一个apk并在设备上对其进行测试时，这不起作用.谁能提供实现此目标的任何见识?

Now the code is working as expected when I run localhost:4200, the tab1 is displayed when the login function is called on button click and the tab is not visible when I click a button that executes the register() function. However when I build an apk, and test it on a device, this doesn't work. Can anyone provide any insight into accomplishing this?

推荐答案

要将数据从一页更新到另一页，我们使用了事件库.但是事件在ionic 5中不再可用. 打击是解决方案. 运行命令:

To update Data from one page to other we used Events library. but events are no longer available in ionic 5. blow is the solution. run command:

ionic generate service events        // this will create events provider

复制粘贴打击代码.

import { Injectable } from '@angular/core';
import {Subject} from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class EventsService {

private fooSubject = new Subject<any>();

constructor() { }


    publishLogin(data: any) {
        this.fooSubject.next(data);
    }

    receiveLogin(): Subject<any> {
        return this.fooSubject;
    }
}

从页面A: 导入您的服务 在构造函数中初始化它//

From Page A: import your service initialize it in constructor //

constructor(public events: EventsService){}

并发布事件，例如

 this.events.publishLogin(yourDataVariable);

在B页中接收它: 导入您的服务 在构造函数中将其初始化//

Receive it in Page B: import your service initialize it in constructor //

    constructor(public events: EventsService){}

this.events.receiveLogin().subscribe((res:any)=>{
        console.log(res);
      })

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