如何从 Ionic 5 中的@ionic/angular 错误修复成员事件 [英] How to fix member Event from @ionic/angular error in Ionic 5

问题描述

我已从 Ionic 4 升级到 Ionic 5，现在出现以下错误:

I have upgraded from Ionic 4 to Ionic 5, now getting following error:

src/app/app.component.ts(4,10) 中的错误:错误 TS2305:模块 '"/node_modules/@ionic/angular/ionic-angular"' 没有导出成员 'Events'.

ERROR in src/app/app.component.ts(4,10): error TS2305: Module '"/node_modules/@ionic/angular/ionic-angular"' has no exported member 'Events'.

以下导入行导致问题:

import { Events, Platform } from '@ionic/angular';

如何修复 Ionic 5 中 @ionic/angular 错误中的成员事件?

How can I fix member Event from @ionic/angular error in Ionic 5?

推荐答案

Events 来自 @ionic/angular 包已从 Ionic 5 中删除.您可以看到重大更改在 Ionic5 这里.

Events from @ionic/angular package got removed from Ionic 5. You can see the breaking changes in Ionic5 here.

正如在重大更改中提到的，您应该使用 Observables.

As it's mentioned in the breaking changes, you should use Observables.

例如，您可以创建以下服务:

For example, you can create the following service:

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

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

    private fooSubject = new Subject<any>();

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

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

现在，您可以订阅任何组件，例如 app.component.ts:

Now, you can subscribe in any component like app.component.ts:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})
export class AppComponent {

    constructor(private globalFooService: GlobalFooService) {
        this.initializeApp();
    }

    initializeApp() {
        // other code

        this.globalFooService.getObservable().subscribe((data) => {
            console.log('Data received', data);
        });
    }
}

现在，您只需从其他组件发出事件:

Now, you just have to emit the event from some other component:

@Component({
    selector: 'app-home',
    templateUrl: 'home.page.html',
    styleUrls: ['home.page.scss']
})
export class HomePage {

    constructor(private globalFooService: GlobalFooService) {
    }

    onSomeButtonClick() {
        this.globalFooService.publishSomeData({
            foo: 'bar'
        });
    }
}

这是一个非常简单的解决方案/示例或 Events 的替代方案，但您可以进一步调整代码以使其成为具有主题的命名空间事件.

This is a very simple solution/example or alternative of the Events but you can tweak your code further to make it a namespaced event with a topic.

我写了一篇关于此的博客，它可以为您提供功能齐全的解决方案，这样您只需更改很少的代码即可升级您的应用.

I have written a blog on this which can give you a full-featured solution so that with very less code change, you can upgrade your app.

https://medium.com/wizpanda/处理 ionic-5-db3ba711dfcd

这篇关于如何从 Ionic 5 中的@ionic/angular 错误修复成员事件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！