counter_screen.dart

import 'package:flutter/material.dart';

class CounterScreen extends StatefulWidget {
  const CounterScreen({Key? key}) : super(key: key);

  @override
  State<CounterScreen> createState() => _CounterScreenState();
}

class _CounterScreenState extends State<CounterScreen> {
  int hitungan = 0;
  hitungTambah(){
    setState(() {
      hitungan++;
    });
  }
  hitungKurang(){
    setState(() {
      hitungan--;
    });
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Counter Screen'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Anda sudah klik $hitungan'),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                ElevatedButton(
                  onPressed: () {
                    hitungTambah();
                  },
                  child: Text('Tambah'),
                ),
                SizedBox(width: 10,),
                ElevatedButton(
                  onPressed: () {
                    hitungKurang();
                  },
                  child: Text('Kurang'),
                ),
              ],
            ),

          ],
        ),
      ),
    );
  }
}