我在应用程序中使用了全屏对话框,以使用户在文本字段中输入值。这些值中有些是字符串,有些是整数。因此,我想相应地更改键盘,以使不必要的键消失。这是我的实现:
import 'package:flutter/material.dart';
import 'package:meal_tracker/model/food_model.dart';
class AddFoodDialog extends StatelessWidget {
TextEditingController nameController = TextEditingController(),
carbsController = TextEditingController(),
fatController = TextEditingController(),
proteinController = TextEditingController(),
amountController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Add Food"),
actions: <Widget>[
FlatButton(
child: Text(
"SAVE",
style: TextStyle(color: Colors.white),
),
onPressed: () {
_handleSave(context);
},
)
],
),
body: Form(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: "Name"),
controller: nameController,
),
TextFormField(
decoration: InputDecoration(labelText: "Carbs per 100g"),
controller: carbsController,
keyboardType: TextInputType.number,
),
TextFormField(
decoration: InputDecoration(labelText: "Fat per 100g"),
controller: fatController,
keyboardType: TextInputType.number,
),
TextFormField(
decoration: InputDecoration(labelText: "Protein per 100g"),
controller: proteinController,
keyboardType: TextInputType.number,
),
TextFormField(
decoration: InputDecoration(labelText: "Amount in g"),
controller: amountController,
keyboardType: TextInputType.number,
),
],
),
)),
);
}
void _handleSave(BuildContext context) {
print("Dialog text: " + nameController.text);
Navigator.of(context).pop(Food(
name: nameController.text,
carbsPer100g: double.parse(carbsController.text),
fatPer100g: double.parse(fatController.text),
proteinPer100g: double.parse(proteinController.text),
amount: double.parse(amountController.text)));
}
}
问题是,当我在具有
TextInputType.text
的“名称”文本字段中输入内容,然后点击另一个具有TextInputType.number
的文本字段时,“名称”字段会被清除,没有明显的原因。反之亦然。 最佳答案
我不得不将TextEditingControllers放入一个有状态的小部件中,这确实可以正常工作。感谢乔纳·威廉姆斯的快速回复!
关于dart - 在TextInputType更改后使用 Controller 重置的Flutter TextField,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/51518321/