criada alguns widgets padrões e ajustada a tela de login

lib/screens/login_screen.dart

@@ -1,5 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'package:rkm/utils/color_palette.dart';
+import 'package:rkm/utils/const_variable.dart';
 import 'package:rkm/widgets/button_default.dart';
+import 'package:rkm/widgets/input_text.dart';
+import 'package:rkm/widgets/text_default.dart';
 
 class LoginScreen extends StatefulWidget {
   const LoginScreen({Key? key}) : super(key: key);
@@ -9,19 +14,112 @@ class LoginScreen extends StatefulWidget {
 }
 
 class _LoginScreenState extends State<LoginScreen> {
+
+  var inputUser = TextEditingController();
+  var inputPassword = TextEditingController();
+  String error = '';
+  String? now;
+  String? selectCity;
+
+  checkLogin(){
+    if(inputUser.text.isNotEmpty && inputPassword.text.isNotEmpty && inputUser.text == 'teste' && inputPassword.text == '123'){
+      if(selectCity!=null){
+        if(selectCity=='Piracicaba'){
+          setState(() {
+            error = '';
+            inputPassword.clear();
+            inputUser.clear();
+            selectCity = null;
+          });
+          Navigator.pushNamed(context, '/home');
+        }else{
+          setState(() {
+            error = 'Unidade Inválida';
+          });
+        }
+      }else{
+        setState(() {
+          error = 'Selecione sua unidade';
+        });
+      }
+    }else{
+      setState(() {
+        error = 'Usuário/senha inválido(s)';
+      });
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    setState(() {
+      now = DateFormat('dd/MM/yyyy kk:mm:ss').format(DateTime.now());
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
+
+    double width = MediaQuery.of(context).size.width;
+
     return Scaffold(
+      appBar: AppBar(
+        title: TextDefault(text: 'Login',fontSize: 30,color: ColorPalette.white),
+      ),
+      bottomSheet: Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: TextDefault(
+          text: 'Última sincronização $now',
+          fontSize: 20,
+          color: ColorPalette.black54,
+        ),
+      ),
       body: Container(
         child: Center(
             child: Column(
               mainAxisSize: MainAxisSize.min,
               children: [
-                Text('Login'),
+                TextDefault(text: 'Login',fontSize: 30),
+                SizedBox(height: 10),
+                Container(
+                  width: width*0.6,
+                  child: DropdownButtonHideUnderline(
+                    child: DropdownButton<String>(
+                      hint: TextDefault(text: 'Selecione a cidade'),
+                        value: selectCity,
+                        items: ConstVariable().itensCity.map((value) => DropdownMenuItem(
+                            value: value,
+                            child: TextDefault(
+                              text: value,
+                            ),
+                          )
+                        ).toList(),
+                        onChanged: (value){
+                          setState(() {
+                            selectCity = value!;
+                          });
+                        }
+                    ),
+                  ),
+                ),
+                InputText(
+                  hint: 'Usuário',
+                  controller: inputUser,
+                  width: width*0.6
+                ),
+                SizedBox(height: 10),
+                InputText(
+                  hint: 'Senha',
+                  obscure: true,
+                  controller: inputPassword,
+                  width: width*0.6
+                ),
+                SizedBox(height: 10),
+                TextDefault(text: error,color: ColorPalette.red),
                 ButtonDefault(
-                  onPressed: ()=>Navigator.pushNamed(context, '/home'),
+                  onPressed: ()=>checkLogin(),
                   title: 'Entrar'
-                )
+                ),
               ],
             )
         ),