Set dynamic ion-checkbox value programmaticaly?

Ionic Framework ionic-v3
1 
    <ion-content>
      <ion-list>
        <ion-item text-wrap *ngFor="let obj of productList">
          <ion-label>{{obj.name}}</ion-label>
          <ion-checkbox color="dark" (ionChange)="checkBoxChanged(obj)"></ion-checkbox>
        </ion-item>
      </ion-list>
    </ion-content>

how can I checked ion-checkbox programmaticaly?