change page navigation

lib/pages/package/package_new.dart

@@ -10,6 +10,7 @@ import 'package:fcs/pages/widgets/display_text.dart';
 import 'package:fcs/pages/widgets/fcs_id_icon.dart';
 import 'package:fcs/pages/widgets/local_text.dart';
 import 'package:fcs/pages/widgets/progress.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -81,7 +82,7 @@ class _PackageNewState extends State<PackageNew> {
           appBar: AppBar(
             centerTitle: true,
             leading: new IconButton(
-              icon: new Icon(Icons.close, color: primaryColor, size: 30),
+              icon: new Icon(CupertinoIcons.back, color: primaryColor, size: 30),
               onPressed: () => Navigator.of(context).pop(),
             ),
             shadowColor: Colors.transparent,
@@ -171,7 +172,7 @@ class _PackageNewState extends State<PackageNew> {
   _addPackage() async {
     Package package = await Navigator.push<Package>(
       context,
-      BottomUpPageRoute(TrackingIDPage()),
+      CupertinoPageRoute(builder: (context) => TrackingIDPage()),
     );
 
     if (package != null) {