CODEWITHSUNDEEP
flutter
j e
j e

Reputation: 21

Flutter: Update AppBar title from Streambuilder?

I'm populating a ListView from Streambuilder and want to show the length/nr of documents in the AppBar title. Right now I'm calling SetState everytime there's a change in the stream. It works but "feels" kinda resource heavy. Any ideas?

Thanks in advance.

Best, /j

StreamBuilder(
    stream: Firestore.instance.collection('users').snapshots(),
    builder: (context, snapshot) {
    if (!snapshot.hasData) return const Text('Loading...');
        appBarTitle = snapshot.data.documents.length;
        Future.delayed(Duration.zero, () {
            setState(() {           
            });
        }); 
    },
);

Upvotes: 2

Views: 2069

Answers (1)

mohammad alipour
mohammad alipour

Reputation: 61

you can wrap title of appBar with Stream builder to update your screen title like this code

 AppBar(title: StreamBuilder<Object>(
    stream: bloc.myStream,
    builder: (context, snapshot) {
      return yourCustomWidget();
    }
  )

Upvotes: 3

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