상태관리 1page

readme.md

상태관리 1page

Created with <3 with dartpad.dev.

main.dart

import 'package:flutter/material.dart';
// 1페이지에서 1개의 클래스에서 같은 상황이라서 어렵지않게 상태를 공유 할 수 있다. 
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Todo App',
      home: TodoListScreen(),
    );
  }
}

class TodoListScreen extends StatefulWidget {
  @override
  _TodoListScreenState createState() => _TodoListScreenState();
}

class _TodoListScreenState extends State<TodoListScreen> {
  List<String> todos = [];
  String todoStatus = "Status : ";
  TextEditingController controller = TextEditingController();

  void addTodo() {
    setState(() {
      todos.add(controller.text);
      controller.clear();
      todoStatus = "Status : ${todos.length}";
    });
  }

  void removeTodo(int index) {
    setState(() {
      todos.removeAt(index);
      todoStatus = "Status : ${todos.length}";
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Todo List')),
      body: Column(
        children: [
          Text(todoStatus),
          Expanded(
            child: ListView.builder(
              itemCount: todos.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(todos[index]),
                  trailing: IconButton(
                    icon: Icon(Icons.delete),
                    onPressed: () => removeTodo(index),
                  ),
                );
              },
            ),
          ),
          TextField(
            controller: controller,
            decoration: InputDecoration(
              labelText: 'Add todo',
              suffixIcon: IconButton(
                icon: Icon(Icons.add),
                onPressed: addTodo,
              ),
            ),
          ),
        ],
      ),
    );
  }
}