ionic 3 Close ion-item-sliding

the other answers are totaly correct but we don't need to pass a refrence of component just tp call close method , I usually try to do something like this logic if possible on the template,and here is a prefect example where we just want to call a method related to component.

<ion-list>
  <ion-item-sliding #slidingItem>
    <ion-item>
      Item
    </ion-item>
    <ion-item-options>
     <button ion-button (click)="share();slidingItem.close()">Share</button>
     <button ion-button routerLink="/" (click)="slidingItem.close()"> Det</button>
    </ion-item-options>
  </ion-item-sliding>
</ion-list>

with event binding we can call more than method if we separate them with ; like this (click)="share();slidingItem.close()"

From the Ionic Documentation:

Html:

<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>

TypeScript:

import { Component } from '@angular/core';
import { ItemSliding } from 'ionic-angular';

@Component({...})
export class MyClass {
  constructor() { }

  share(slidingItem: ItemSliding) {
    slidingItem.close();
  }
}

Just like you can see in the docs:

Close the sliding item. Items can also be closed from the List.

The sliding item can be closed by grabbing a reference to ItemSliding. In the below example, the template reference variable slidingItem is placed on the element and passed to the share method.

<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();
  }
}