다크모드 셋팅

import {
  useColorScheme,
} from 'react-native';

...

const App = ()=>{
	const isDarkMode = useColorScheme() === 'dark';

	return(
		<SafeAreaView>
			<StatusBar barStyle={isDarkMode ? 'light-content' : 'dark-content'} />
			<Text
        style={[
          styles.sectionTitle,
          {
            color: isDarkMode ? Colors.white : Colors.black,
          },
        ]}>
        {title}
      </Text>
		</SafeAreaView>
	)
}