Firestore 使用 Flutter 以奇怪的格式保存数据

我try 在Firebase上保存数据，但数据以奇怪的方式存储，尽管值是如下所示的字符串:

Description
"TextEditingController#d9024(TextEditingValue(text: ┤├, selection: 
TextSelection.invalid, composing: TextRange(start: -1, end: -1)))"
Price
"TextEditingController#c11e0(TextEditingValue(text: ┤├, selection: 
TextSelection.invalid, composing: TextRange(start: -1, end: -1)))"
Title
"TextEditingController#dcebb(TextEditingValue(text: ┤├, selection: 
TextSelection.invalid, composing: TextRange(start: -1, end: -1)))"
UID
"gWYqXqsvTdVI1Sfa8MP4SrFTEmB2"

以下是我的代码:

final adTitleController = TextEditingController();
final priceController = TextEditingController();
final adDescription = TextEditingController();

Future<void> createAds() async {
CollectionReference ads = FirebaseFirestore.instance.collection('Ads');

String? adid = ads.id.toString();

String? title = adTitleController.toString();
String? desc = adDescription.toString();
String? price = priceController.toString();
String? userId;
String? adId;
ads.add({
  "UID": FirebaseAuth.instance.currentUser?.uid,
  "AdId": adId,
  "Title": title,
  "Description": desc,
  "Price": price,
});
}