flutter - Flutter-StreamBuilder-Api-页面刷新

Question

我的Widget内部有一个StreamBuilder:

StreamBuilder(
  stream: stream.asStream(),
  builder: (BuildContext context, AsyncSnapshot snapshot) {
...

流在void initState内部定义。
fetchPost()从Api调用信息:

@override
  void initState() {
    super.initState();

    setState(() {
      stream = fetchPost();
    });

  }

fetchPost():

Future<List<User>> fetchPost() async {
  final response = await http.get('url');
  final jsonResponse = json.decode(response.body);

  List<User> users = [];

  for(var u in jsonResponse){
    User user = User(
      id: u["id"].toString(), 
      uname: u["username"],
      firstname: u["firstname"],
      lastname: u["lastname"],
      email: u["email"],
    );
    users.add(user);
  }
  return users;
}

在通过新页面更改列表中的某些内容(API也进行了更改)后，它导航回到StreamBuilder:

Navigator.pushReplacement(
  context,
  new MaterialPageRoute(builder: (context) => new UserDart())
);        

但是StreamBuilder有时不刷新。我需要做的是刷新数据。因此，它需要在每次页面加载时调用fetchPost()，但是如何？

Answer 1

你可以这样写

    Navigator.pushReplacement(context,new MaterialPageRoute(
        builder: (context) => new UserDart())).then((onValue) {
                 fetchPost();  // this will called when it navigates back from UserDart 
    });