Ionic 2:如何从Popover组件调用父页面功能

Question

我有一个页面组件,其中包含一个打开PopoverController的按钮.根据Ionic Docs,弹出窗口需要另一个特定的内容组件.

在主页面中,我有一个需要从弹出窗口组件调用的函数,但我还没有找到如何访问"父级"方法.我试过@ViewChild但孩子却是undefined.

import { Component, ViewChild } from '@angular/core';
import { Content, NavController, NavParams, Platform, PopoverController, ViewController } from 'ionic-angular';

// Parent page:
@Component({
    selector: 'page-favorites',
    templateUrl: 'favorites.html'
})
export class FavoritesPage {
    constructor(public popoverCtrl: PopoverController) {
    }

    openOptions(ev?: Event) {
        let popover = this.popoverCtrl.create(FavoritesPopover);
        popover.present({ ev: ev });
    }

    showConfirm() {
        // This is the function I need to call from FavoritesPopover
    }
}

// Popover content:
@Component({
  template: `
    <ion-list>
        <button ion-item (click)="showConfirm()">Show confirm</button>
    </ion-list>`
})
export class FavoritesPopover {
    @ViewChild(FavoritesPage) favoritesPage: FavoritesPage;

    showConfirm() {
        this.favoritesPage.showConfirm(); // It doesn't work, favoritesPage is undefined
    }
}

正如你所看到的,我刚刚开始使用Ionic 2和Angular,所以任何帮助都会非常感激!

Answer 1

您可以通过将对象作为第二个参数传递给create方法,将数据(和函数)传递给popover :

openOptions(ev?: Event) {
    let popover = this.popoverCtrl.create(FavoritesPopover, {
        showConfirm: function() {
            alert('yay');
        }
    });
    popover.present({ ev: ev });
}

然后,您应该注入NavParams弹出视图和get您传递的函数:

import {NavParams} from 'ionic-angular';

export class FavoritesPopover {
    constructor(public params: NavParams) {}

    showConfirm() {
        this.params.get('showConfirm')(); 
    }
}