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counterApp.js
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counterApp.js
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import React from 'react';
import {
View,
Text,
SafeAreaView,
StyleSheet,
StatusBar,
TouchableOpacity,
} from 'react-native';
//hooks works in the same way as React so we import from the react instead of react-native
import { useState, useCallback } from 'react';
const App = () => {
const [value, setValue] = useState(0);
const handleIncrementCallback = useCallback(() => {
setValue((currentValue) => currentValue + 1);
}, []); //empty array of dependecies i.e, on which this function re-renders
return (
<SafeAreaView style={styles.safeArea}>
<View>
<Text> Hey I am on! </Text>
<Text>Let's make a counter</Text>
<Text> {value} </Text>
<TouchableOpacity onPress={handleIncrementCallback}>
<Text>Increment</Text>
</TouchableOpacity>
<TouchableOpacity
onPress={() => setValue((currentValue) => currentValue - 1)}
>
<Text>Decrement</Text>
</TouchableOpacity>
</View>
</SafeAreaView>
);
};
const styles = StyleSheet.create({
safeArea: {
flex: 1,
paddingTop: StatusBar.currentHeight || 0, // to solve the problem of notch we can also check whether given device is ios or android
// Platform.OS === 'android' || 'ios' and so on to check for OS
},
});
export default App;