How to make a function that fetches more content from an API for the pull to refresh in ionic

Ionic Framework ionic-v3
1

how can i implement it in my project
This is my home.html

<ion-refresher (ionRefresh)="doRefresh($event)">
    <ion-refresher-content pullingIcon="arrow-dropdown" pullingText="Pull to refresh" refreshingSpinner="crescent" refreshingText="Refreshing...">
    </ion-refresher-content>
  </ion-refresher>

This is the home.ts

ionViewDidLoad() {
    this.tabBarElement.style.display = 'none';
    setTimeout(() => {
      this.splash = false;
      this.tabBarElement.style.display = 'flex';
    }, 4000);
  }
2

Implement the doRefresh method as is probably also described in the documentation.