import React, { useState } from 'react';
import { StyleSheet, Text, View, Button } from 'react-native';
 
 
 
export default function App() {
  const [count, setCount] = useState(0);
 
  function increment() {
    setCount(count+1);
  }
 
  return (
    <View style={styles.container}>
      <Text>Számláló</Text>
      <Button 
        title='Növel'
        onPress={increment}
      />
      <Text>{ count }</Text>
    </View>
  );
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});