components/WriteHeader.js - 체크 버튼

function WriteHeader({onSave}) {
  const navigation = useNavigation();
  const onGoBack = () => {
    navigation.pop();
  };
  return (
    <View style={styles.block}>
      <View style={styles.iconButtonWrapper}>
        <TransparentCircleButton
          onPress={onGoBack}
          name="arrow-back"
          color="#424242"
        />
      </View>
      <View style={styles.buttons}>
        <TransparentCircleButton
          name="delete-forever"
          color="#ef5350"
          hasMarginRight
        />
        <TransparentCircleButton
          name="check"
          color="#009688"
          onPress={onSave}
        />
      </View>
    </View>
  );
}

(...)

WriteHeader에서는 체크 버튼을 보여주고 있는 TransparentCircleButton에 onPress Props로 onSave Props를 전달해줬습니다.