add a duration in function before modal closes and move to next page ionic code example

Example 1: ion modal dismiss

export class ModalPage {
  ...
  dismiss() {
    // using the injected ModalController this page
    // can "dismiss" itself and optionally pass back data
    this.modalCtrl.dismiss({
      'dismissed': true
    });
  }
}

Example 2: ionic modal example

import { Component } from '@angular/core';
import { ModalController } from '@ionic/angular';
import { ModalPage } from '../modal/modal.page';

@Component({
  selector: 'modal-example',
  templateUrl: 'modal-example.html',
  styleUrls: ['./modal-example.css']
})
export class ModalExample {
  constructor(public modalController: ModalController) {

  }

  async presentModal() {
    const modal = await this.modalController.create({
      component: ModalPage,
      cssClass: 'my-custom-class'
    });
    return await modal.present();
  }
}