Keypad cover the ion-footer in ios

Ionic Framework ionic-v3
1

i have button in ion-footer , when my ios keypad is open it cover the ion-footer.In android it’s fine. how can i do that.please help me. This is my code thanks.

<ion-footer>
<ion-row>
    <ion-col>
      <button ion-button (click)="btnsubmit()" full>Save</button>
    </ion-col>
    <ion-col>
      <button ion-button (click)="cancel()" full>Cancel</button>
    </ion-col>
  </ion-row>
</ion-footer>
2