如何从Firestore中获取特定数据并在Objective-C中进行更新

FIRFirestore *db = [FIRFirestore firestore];
FIRCollectionReference *collectionRef = [db collectionWithPath:@"your_collection"];
FIRQuery *query = [collectionRef whereField:@"your_field" isEqualTo:@"your_value"];

[query getDocumentsWithCompletion:^(FIRQuerySnapshot *snapshot, NSError *error) {
    if (error != nil) {
        NSLog(@"Error getting documents: %@", error);
    } else {
        for (FIRDocumentSnapshot *document in snapshot.documents) {
            NSLog(@"%@ => %@", document.documentID, document.data);
            
            // 在这里进行更新操作
            FIRDocumentReference *docRef = [collectionRef documentWithPath:document.documentID];
            [docRef updateData:@{@"your_field": @"new_value"} completion:^(NSError * _Nullable error) {
                if (error != nil) {
                    NSLog(@"Error updating document: %@", error);
                } else {
                    NSLog(@"Document updated successfully");
                }
            }];
        }
    }
}];