close ion-item-sliding
<ion-list>
  <ion-item-sliding #slidingItem>
    <ion-item>
      Item
    </ion-item>
    <ion-item-options>
      <button ion-button (click)="share(slidingItem)">Share</button>
    </ion-item-options>
  </ion-item-sliding>
</ion-list>
// And then:
import { Component } from '@angular/core';
import { ItemSliding } from 'ionic-angular';
@Component({...})
export class MyClass {
  constructor() { }
  share(slidingItem: ItemSliding) {
    slidingItem.close();
  }
}
