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在我的应用程序中，我使用firebase，我将主要用户数据保存在字典中，并将其保存为重要的（特征）行。用户可以添加，修改和删除数据。有好几次我从数据库中获得成功的数据，但出于某种原因，我得到了一个字典而不是数组。而且，这个数组包含NSNull应用程序和下降的对象。下面是我的代码检索数据：为什么Firebase返回数组而不是字典？
[self.ref observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
TSFireUser *user = [[TSFireUser alloc] init];
NSString *token = [[NSUserDefaults standardUserDefaults] valueForKey:@"token"];
FIRUser *fireUser = [FIRAuth auth].currentUser;
NSString *key = [NSString stringWithFormat:@"dataBase/users/%@/userData", fireUser.uid];
NSString *keyToParameters = [NSString stringWithFormat:@"dataBase/users/%@", fireUser.uid];
FIRDataSnapshot *fireUser = [snapshot childSnapshotForPath:key];
FIRDataSnapshot *fireUserParameters = [snapshot childSnapshotForPath:keyToParameters];
FIRDataSnapshot *userIdent = fireUser.value[@"userID"];
FIRDataSnapshot *userName = fireUser.value[@"displayName"];
FIRDataSnapshot *userEmail = fireUser.value[@"email"];
FIRDataSnapshot *userPhoto = fireUser.value[@"photoURL"];
FIRDataSnapshot *dateOfBirth = fireUser.value[@"dateOfBirth"];
FIRDataSnapshot *location = fireUser.value[@"location"];
FIRDataSnapshot *gender = fireUser.value[@"gender"];
FIRDataSnapshot *parameters = fireUserParameters.value[@"parameters"];
user.uid = (NSString *)userIdent;
user.displayName = (NSString *)userName;
user.email = (NSString *)userEmail;
user.photoURL = (NSString *)userPhoto;
user.dateOfBirth = (NSString *)dateOfBirth;
user.location = (NSString *)location;
user.gender = (NSString *)gender;
user.parameters = (NSMutableDictionary *)parameters;}];
我会任何帮助