Add show and hide whether checkbox is active or not

src/app/pages/chat/new-group/new-group.page.ts

@@ -9,6 +9,7 @@ import { ContactsPage } from './contacts/contacts.page';
 })
 export class NewGroupPage implements OnInit {
   showLoader: boolean;
+  showDuration: boolean;
 
   constructor(
     private modalController: ModalController, 
@@ -18,6 +19,9 @@ export class NewGroupPage implements OnInit {
 
   ngOnInit() {
 
+  }
+  _ionChange(event){
+    this.showDuration = event.detail.checked;
   }
   close(){
     this.modalController.dismiss();