Continue autoplay after touch slide

Ionic Framework ionic-v3
1

I have a ionic slides and setup it autoplay, but when I touch to swipe the slide, it’s not autoplay anymore. How can I keep it autoplay even it be touched?

2

html:

<ion-slides #bannerSlides
              pager="true"
              autoplay="1000"
              loop=false
              (ionSlideAutoplayStop)="autoplaySlidesStop($event)"
              (ionSlideWillChange)="slideWillChange($event)">
    <ion-slide>
...
    </ion-slide>
  </ion-slides>

ts:

@ViewChild('bannerSlides') bannerSlidesRef: Slides;
...
autoplaySlidesStop(event): void {
    if (this.bannerSlidesRef && this.bannerSlidesRef._slides.length > 1) {
      this.bannerSlidesRef.startAutoplay();
    }
  }
...
slideWillChange(event): void {
    if (this.bannerSlidesRef.getActiveIndex() > this.bannerSlidesRef._slides.length - 1) {
      this.bannerSlidesRef._activeIndex = this.bannerSlidesRef._activeIndex - 1;
    } else {
    }
  }