Check out example codes for "ion slides next by button". It will help you in understanding the concepts better.

Code Example 1

import { ViewChild } from '@angular/core';
import { IonSlides } from '@ionic/angular';
...
@ViewChild('slides') slides: IonSlides;
next() {
	this.slides.slideNext();
}

prev() {
	this.slides.slidePrev();
}
...
// in html
<ion-slides #slides>
   <ion-slide>
   </ion-slide>

   <ion-slide>
   </ion-slide>

  <button type="submit" float-left ion-button  color="primary" class="btnPrev" (click)="prev()">Prev</button>
  <button type="submit" float-right ion-button color="primary" class="btnNext" (click)="next()">Next</button>
     
</ion-slides>

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