Flutter initState wait for async function to complete - flutter

Question

in my main.dart i have among others those two functions:
Future<void> _fetchMasterData() async {
print("Start fetch");
var jwt = await API.attemptLogIn();
if (jwt != null) {
Map<String, dynamic> answer = jsonDecode(jwt);
if (answer['message'] == 'Auth ok') {
jwtToken = 'Bearer ' + answer['token'];
}
}
await _getArticles();
await _getMainCategories();
await _getIngredients();
await _getArticleIngredients();
print("EndMasterData fetch");
}
And
#override
void initState() {
super.initState();
_fetchMasterData();
}
What i would like to have is to wait in initState till _fethcMasterData is done bevore Widgert build is called.
Is that possible? Many thanks for any help!

Answer 1

Here how I use an async func in initstate;
builder() async {
favoriteDatabase =
await $FloorFavoriteDatabase.databaseBuilder('favorite_database.db')
.build();
setState(() {
favoriteDao = favoriteDatabase.favoriteDao;
});
}
#override
void initState() {
// TODO: implement initState
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_) {
WidgetsBinding.instance.addPostFrameCallback((_) =>
getNamePreferences().then(updateName));
});
builder();
favoriteDao.findAllMoviesAsStreamW();
favoriteDao.findAllMoviesAsStream();
}
Also you can check this mini article too.

Answer 2

It is not possible to await in initState, so when you finish all loading process then you can call SetState method which populate your widget with actual data.
Second solution could be use of futurebuilder or streambuilder where you want to show data but it is only possible if any methods data is not dependent on each other.
Future<void> _fetchMasterData() async {
print("Start fetch");
var jwt = await API.attemptLogIn();
if (jwt != null) {
Map<String, dynamic> answer = jsonDecode(jwt);
if (answer['message'] == 'Auth ok') {
jwtToken = 'Bearer ' + answer['token'];
}
}
await _getArticles();
await _getMainCategories();
await _getIngredients();
await _getArticleIngredients();
print("EndMasterData fetch");
SetState((){}); // added line
}