【发布时间】：2021-05-31 15:56:24
【问题描述】：
从 Firebase Cloud 加载帖子时显示错误。我在我的应用程序中使用提供程序
setState() or markNeedsBuild() called during build.
详细错误
════════ Exception caught by foundation library ════════════════════════════════
The following assertion was thrown while dispatching notifications for PostFunctions:
setState() or markNeedsBuild() called during build.
This _InheritedProviderScope<PostFunctions> widget cannot be marked as needing to build because the framework is already in the process of building widgets. A widget can be marked as needing to be built during the build phase only if one of its ancestors is currently building. This exception is allowed because the framework builds parent widgets before children, which means a dirty descendant will always be built. Otherwise, the framework might not visit this widget during this build phase.
我加载帖子时的代码..
Widget feedBody(BuildContext context) {
return SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.only(top: 8.0),
child: Container(
child: StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.orderBy('time', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return Center(
child: SizedBox(
height: 200.0,
width: 200.0,
child: Lottie.asset('assets/animations/loading.json'),
),
);
} else {
return loadPosts(context, snapshot);
}
},
),
height: MediaQuery.of(context).size.height * 0.80,
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(
color: constantColors.darkColor.withOpacity(0.6),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(18.0),
topRight: Radius.circular(18.0),
),
),
),
),
);
}
我的加载邮政编码
Widget loadPosts(
BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
return ListView(
children: snapshot.data.docs.map((DocumentSnapshot documentSnapshot) {
Provider.of<PostFunctions>(context, listen: false)
.showTimeAgo(documentSnapshot.data()['time']);
return Container(
height: MediaQuery.of(context).size.height * 0.62,
width: MediaQuery.of(context).size.width,
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.only(
top: 8.0,
left: 8.0,
),
child: Row(
children: [
GestureDetector(
onTap: () {
if (documentSnapshot.data()['useruid'] !=
Provider.of<Authenticationss>(context, listen: false)
.getUserUid) {
Navigator.pushReplacement(
context,
PageTransition(
child: AltProfile(
userUid: documentSnapshot.data()['useruid'],
),
type: PageTransitionType.bottomToTop,
),
);
}
},
child: CircleAvatar(
backgroundColor: constantColors.blueGreyColor,
radius: 20.0,
backgroundImage:
NetworkImage(documentSnapshot.data()['userimage']),
),
),
Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Container(
width: MediaQuery.of(context).size.width * 0.6,
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
child: Text(
documentSnapshot.data()['caption'],
style: TextStyle(
color: constantColors.greenColor,
fontWeight: FontWeight.bold,
fontSize: 16.0),
),
),
Container(
child: RichText(
text: TextSpan(
text: documentSnapshot.data()['username'],
style: TextStyle(
color: constantColors.blueColor,
fontSize: 14.0,
fontWeight: FontWeight.bold,
),
children: <TextSpan>[
TextSpan(
text:
' , ${Provider.of<PostFunctions>(context, listen: false).getImageTimePosted.toString()}',
style: TextStyle(
color: constantColors.lightColor
.withOpacity(0.8),
),
)
],
),
),
),
],
),
),
),
Container(
width: MediaQuery.of(context).size.width * .2,
height: MediaQuery.of(context).size.height * 0.05,
child: StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.doc(documentSnapshot.data()['caption'])
.collection('awards')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return ListView(
scrollDirection: Axis.horizontal,
children: snapshot.data.docs
.map((DocumentSnapshot documentSnapshot) {
return Container(
height: 30.0,
width: 30.0,
child: Image.network(
documentSnapshot.data()['award']),
);
}).toList(),
);
}
},
),
),
],
),
),
Padding(
padding: const EdgeInsets.only(top: 8.0),
child: Container(
height: MediaQuery.of(context).size.height * 0.45,
width: MediaQuery.of(context).size.width,
child: FittedBox(
child: Image.network(
documentSnapshot.data()['postimage'],
scale: 2,
),
),
),
),
Padding(
padding: const EdgeInsets.only(top: 8.0),
child: Padding(
padding: const EdgeInsets.only(left: 21.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
width: 80.0,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
GestureDetector(
onLongPress: () {
Provider.of<PostFunctions>(context, listen: false)
.showLikes(
context,
documentSnapshot.data()['caption'],
);
},
onTap: () {
print('adding like');
Provider.of<PostFunctions>(context, listen: false)
.addLike(
context,
documentSnapshot.data()['caption'],
Provider.of<Authenticationss>(context,
listen: false)
.userUid);
},
child: Icon(
FontAwesomeIcons.heart,
color: constantColors.redColor,
size: 22.0,
),
),
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.doc(documentSnapshot.data()['caption'])
.collection('likes')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Text(
snapshot.data.docs.length.toString(),
style: TextStyle(
color: constantColors.whiteColor,
fontWeight: FontWeight.bold,
fontSize: 18.0,
),
),
);
}
},
)
],
),
),
Container(
width: 80.0,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
GestureDetector(
onTap: () {
Provider.of<PostFunctions>(context, listen: false)
.shotCommentSheets(context, documentSnapshot,
documentSnapshot.data()['caption']);
},
child: Icon(
FontAwesomeIcons.comment,
color: constantColors.blueColor,
size: 22.0,
),
),
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.doc(documentSnapshot.data()['caption'])
.collection('comments')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Text(
snapshot.data.docs.length.toString(),
style: TextStyle(
color: constantColors.whiteColor,
fontWeight: FontWeight.bold,
fontSize: 18.0,
),
),
);
}
},
)
],
),
),
Container(
width: 80.0,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
GestureDetector(
onLongPress: () {
Provider.of<PostFunctions>(context, listen: false)
.showAwardPresenter(context,
documentSnapshot.data()['caption']);
},
onTap: () {
Provider.of<PostFunctions>(context, listen: false)
.showReward(context,
documentSnapshot.data()['caption']);
},
child: Icon(
FontAwesomeIcons.award,
color: constantColors.yellowColor,
size: 22.0,
),
),
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.doc(documentSnapshot.data()['caption'])
.collection('awards')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child: CircularProgressIndicator(),
);
} else {
return Padding(
padding: const EdgeInsets.only(left: 8.0),
child: Text(
snapshot.data.docs.length.toString(),
style: TextStyle(
color: constantColors.whiteColor,
fontWeight: FontWeight.bold,
fontSize: 18.0,
),
),
);
}
},
)
],
),
),
Spacer(),
Provider.of<Authenticationss>(context, listen: false)
.getUserUid ==
documentSnapshot.data()['useruid']
? IconButton(
icon: Icon(
EvaIcons.moreVertical,
color: constantColors.whiteColor,
),
onPressed: () {
Provider.of<PostFunctions>(context, listen: false)
.showPostOptions(context,
documentSnapshot.data()['caption']);
},
)
: Container(
height: 0.0,
width: 0.0,
),
],
),
),
),
],
),
);
}).toList());
}
}
【问题讨论】：
标签： flutter google-cloud-firestore provider