我有一个基于列表构建 UI 的 futurebuilder,它完成了这项工作,但是由于每当我导航时一次又一次地构建 UI,我会得到重复的内容。我的问题是,Dart 中是否有一种固有的方法可以从列表中删除重复项?我已经尝试过这个StackOverflow 问题,但它不起作用。
这是我的定制模型:
class HomeList {
Widget navigateScreen;
String imagePath;
PatientInfo patientInfo;
HomeList({
this.navigateScreen,
this.imagePath = '',
this.patientInfo,
});
static List<HomeList> homeList = [];
}
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这是我从 cloud_firestore 获取数据的 futureBuilder 函数:
_getPatients() async {
if (didLoadpatients == 0) {
print('this is didloadpatients at start of func $didLoadpatients');
var document = await db
.collection('users')
.document(mUser.uid)
.collection('patients');
document.getDocuments().then((QuerySnapshot query) async {
query.documents.forEach((f) {
uids.add(f.data['uID']);
});
didLoadpatients++;
print('this is didloadpatients at end of func $didLoadpatients');
for (var i = 0; i < uids.length; i++) {
var userDocuments = await db.collection('users').document(uids[i]);
userDocuments.get().then((DocumentSnapshot doc) {
print(doc.data);
homeList.add(HomeList(
imagePath: 'assets/fitness_app/fitness_app.png',
patientInfo: new PatientInfo.fromFbase(doc.data)));
});
print(homeList);
}
});
} else
print('I am leaving the get patient function');
}
Future<bool> getData() async {
_getCurrentUser();
await Future.delayed(const Duration(milliseconds: 1500), () async {
_getPatients();
});
return true;
}
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任何帮助将不胜感激,谢谢!
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