我正在尝试从用户那里获取 4 个输入以显示最小值、最大值并显示中间值 1 和中间值 2。现在的事实是，每当我尝试输入以对其执行操作以显示我的答案时。它显示“类型'TextEditingController'不是类型转换中类型'int'的子类型”。我使用 int.parse() 方法将其转换为字符串，但仍然没有用。 这是我的代码:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:inputtext/convert.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int min, max, mid1, mid2, temp;
String output = '';
TextEditingController inputvalue1 = new TextEditingController();
TextEditingController inputvalue2 = new TextEditingController();
TextEditingController inputvalue3 = new TextEditingController();
TextEditingController inputvalue4 = new TextEditingController();
// @override
// void initState() {
// super.initState();
// inputvalues = new TextEditingController();
// inputvalues.text = '';
// }
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
'InputValue',
style: TextStyle(
color: Colors.white,
),
),
),
body: Container(
color: Colors.blueAccent[50],
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SizedBox(
height: 5,
),
Flexible(
flex: 1,
child: TextFormField(
autofocus: true,
controller: inputvalue1,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
autofocus: true,
controller: inputvalue2,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
autofocus: true,
controller: inputvalue3,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
//validator: (),
autofocus: true,
controller: inputvalue4,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
RaisedButton(
child: Text(
'Submit',
style: TextStyle(color: Colors.blue),
),
onPressed: () {
comp();
},
),
SizedBox(
height: 10,
),
RaisedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Convert()),
);
},
child: Text(
'Next',
style: TextStyle(color: Colors.blue),
),
),
//Text(result),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
return showDialog(
context: context,
barrierDismissible: true,
builder: (context) {
return SimpleDialog(
title: Text("Values"),
// content: TextField(controller: inputvalue1),
children: <Widget>[
SimpleDialogOption(
onPressed: () {
setState(() {
print('Minimum Value= ' + min.toString());
});
},
),
],
);
},
);
// setState(() {
// print('Minimum Value=' + min.toString());
// print('Maximum Value=' + max.toString());
// print('Mid1=' + mid1.toString());
// print('Mid2 =' + mid2.toString());
// });
// Navigator.of(context).pop();
},
),
);
}
void comp() {
if (inputvalue1.text.toString() == inputvalue2.text.toString() ||
inputvalue1.text.toString() == inputvalue3.text.toString() ||
inputvalue1.text.toString() == inputvalue4.text.toString()) {
print('Please input different number');
} else if (inputvalue2.text.toString() == inputvalue3.text.toString() ||
inputvalue2.text.toString() == inputvalue4.text.toString()) {
print('Please input different number');
} else if (inputvalue3.text.toString() == inputvalue4.text.toString()) {
print('Please enter differet vlaues');
}
//Finding minimum value
if (int.parse(inputvalue1.text) <= int.parse(inputvalue2.text) &&
int.parse(inputvalue1.text) <= int.parse(inputvalue3.text) &&
int.parse(inputvalue1.text) <= int.parse(inputvalue4.text)) {
min = inputvalue1 as int;
} else if (int.parse(inputvalue2.text) <= int.parse(inputvalue3.text) &&
int.parse(inputvalue2.text) <= int.parse(inputvalue4.text)) {
min = inputvalue2 as int;
} else if (int.parse(inputvalue3.text) <= int.parse(inputvalue4.text)) {
min = inputvalue3 as int;
} else {
min = inputvalue4 as int;
}
//finding maximum number
if (int.parse(inputvalue1.text) >= int.parse(inputvalue2.text) &&
int.parse(inputvalue1.text) >= int.parse(inputvalue2.text) &&
int.parse(inputvalue1.text) >= int.parse(inputvalue3.text) &&
int.parse(inputvalue1.text) >= int.parse(inputvalue4.text)) {
max = inputvalue1 as int;
} else if (int.parse(inputvalue2.text) >= int.parse(inputvalue3.text) &&
int.parse(inputvalue2.text) >= int.parse(inputvalue4.text)) {
max = inputvalue2 as int;
} else if (int.parse(inputvalue3.text) >= int.parse(inputvalue4.text)) {
max = inputvalue3 as int;
} else {
max = inputvalue4 as int;
}
//finding mid1
if (int.parse(inputvalue1.text) != min &&
int.parse(inputvalue1.text) != max) {
mid1 = inputvalue1 as int;
} else if (int.parse(inputvalue2.text) != min &&
int.parse(inputvalue2.text) != max) {
mid1 = inputvalue2 as int;
} else if (int.parse(inputvalue3.text) != min &&
int.parse(inputvalue3.text) != max) {
mid1 = inputvalue3 as int;
} else if (int.parse(inputvalue4.text) != min &&
int.parse(inputvalue4.text) != max) {
mid1 = inputvalue4 as int;
}
//finding mid2
if (int.parse(inputvalue1.text) != mid1 &&
int.parse(inputvalue1.text) != min &&
int.parse(inputvalue1.text) != max) {
mid2 = inputvalue1 as int;
} else if (int.parse(inputvalue2.text) != mid1 &&
int.parse(inputvalue2.text) != min &&
int.parse(inputvalue2.text) != max) {
mid2 = inputvalue2 as int;
} else if (int.parse(inputvalue3.text) != mid1 &&
int.parse(inputvalue3.text) != min &&
int.parse(inputvalue3.text) != max) {
mid2 = inputvalue3 as int;
} else if (int.parse(inputvalue4.text) != mid1 &&
int.parse(inputvalue4.text) != min &&
int.parse(inputvalue4.text) != max) {
mid2 = inputvalue4 as int;
}
if (mid1 > mid2) {
temp = mid1;
mid1 = mid2;
mid2 = temp;
}
}
}
感谢您的回答
错误日志
══╡ EXCEPTION CAUGHT BY FOUNDATION LIBRARY ╞════════════════════════════════════════════════════════
I/flutter ( 5462): The following assertion was thrown while dispatching notifications for FocusNode:
I/flutter ( 5462): RenderBox was not laid out: RenderEditable#cd6b6 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5462): 'package:flutter/src/rendering/box.dart':
I/flutter ( 5462): Failed assertion: line 1687 pos 12: 'hasSize'
I/flutter ( 5462):
I/flutter ( 5462): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter ( 5462): more information in this error message to help you determine and fix the underlying cause.
I/flutter ( 5462): In either case, please report this assertion by filing a bug on GitHub:
I/flutter ( 5462): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter ( 5462):
I/flutter ( 5462): When the exception was thrown, this was the stack:
I/flutter ( 5462): #2 RenderBox.size
package:flutter/…/rendering/box.dart:1687
I/flutter ( 5462): #3 EditableTextState._updateSizeAndTransform
package:flutter/…/widgets/editable_text.dart:1729
I/flutter ( 5462): #4 EditableTextState._openInputConnection
package:flutter/…/widgets/editable_text.dart:1415
I/flutter ( 5462): #5 EditableTextState._openOrCloseInputConnectionIfNeeded
package:flutter/…/widgets/editable_text.dart:1441
I/flutter ( 5462): #6 EditableTextState._handleFocusChanged
package:flutter/…/widgets/editable_text.dart:1707
I/flutter ( 5462): #7 ChangeNotifier.notifyListeners
package:flutter/…/foundation/change_notifier.dart:206
I/flutter ( 5462): #8 FocusNode._notify
package:flutter/…/widgets/focus_manager.dart:825
I/flutter ( 5462): #9 FocusManager._applyFocusChange
package:flutter/…/widgets/focus_manager.dart:1456
I/flutter ( 5462): (elided 12 frames from class _AssertionError and package dart:async)
I/flutter ( 5462):
I/flutter ( 5462): The FocusNode sending notification was:
I/flutter ( 5462): FocusNode#bbc92
I/flutter ( 5462): ════════════════════════════════════════════════════════════════════════════════════════════════════
Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast
When the exception was thrown, this was the stack
#0 _HomePageState.comp
package:inputtext/homepage.dart:213
#1 _HomePageState.build.<anonymous closure>
package:inputtext/homepage.dart:133
#2 _InkResponseState._handleTap
package:flutter/…/material/ink_well.dart:706
#3 _InkResponseState.build.<anonymous closure>
package:flutter/…/material/ink_well.dart:789
#4 GestureRecognizer.invokeCallback
package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(212.6, 351.2)
finalLocalPosition: Offset(50.8, 5.9)
button: 1
sent tap down
════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════
Reloaded 2 of 480 libraries in 585ms.
Reloaded 2 of 480 libraries in 262ms.
════════ Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast
When the exception was thrown, this was the stack
#0 _HomePageState.comp
package:inputtext/homepage.dart:210
#1 _HomePageState.build.<anonymous closure>
package:inputtext/homepage.dart:133
#2 _InkResponseState._handleTap
package:flutter/…/material/ink_well.dart:706
#3 _InkResponseState.build.<anonymous closure>
package:flutter/…/material/ink_well.dart:789
#4 GestureRecognizer.invokeCallback package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(201.1, 369.1)
finalLocalPosition: Offset(39.4, 23.8)
button: 1
sent tap down
════════════════════════════════════════════════════════════════════════════════
Reloaded 2 of 480 libraries in 2,487ms.
════════ Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast
When the exception was thrown, this was the stack
#0 _HomePageState.comp
package:inputtext/homepage.dart:210
#1 _HomePageState.build.<anonymous closure>
package:inputtext/homepage.dart:133
#2 _InkResponseState._handleTap
package:flutter/…/material/ink_well.dart:706
#3 _InkResponseState.build.<anonymous closure>
package:flutter/…/material/ink_well.dart:789
#4 GestureRecognizer.invokeCallback
package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(220.2, 368.0)
finalLocalPosition: Offset(58.5, 22.6)
button: 1
sent tap down
════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
最佳答案
只需检查下面的示例
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(HomePage());
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int min, max, mid1, mid2, temp;
String output = '';
TextEditingController inputvalue1 = new TextEditingController();
TextEditingController inputvalue2 = new TextEditingController();
TextEditingController inputvalue3 = new TextEditingController();
TextEditingController inputvalue4 = new TextEditingController();
// @override
// void initState() {
// super.initState();
// inputvalues = new TextEditingController();
// inputvalues.text = '';
// }
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(
'InputValue',
style: TextStyle(
color: Colors.white,
),
),
),
body: Container(
color: Colors.blueAccent[50],
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SizedBox(
height: 5,
),
Flexible(
flex: 1,
child: TextFormField(
autofocus: true,
controller: inputvalue1,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
autofocus: true,
controller: inputvalue2,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
autofocus: true,
controller: inputvalue3,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
Center(
child: TextFormField(
//validator: (),
autofocus: true,
controller: inputvalue4,
keyboardType: TextInputType.number,
inputFormatters: <TextInputFormatter>[
WhitelistingTextInputFormatter.digitsOnly,
],
decoration: InputDecoration(
hoverColor: Colors.blueGrey,
border: OutlineInputBorder(
borderRadius: BorderRadius.all(
Radius.circular(4.0),
),
),
labelText: 'Enter Values',
),
),
),
SizedBox(height: 10),
RaisedButton(
child: Text(
'Submit',
style: TextStyle(color: Colors.blue),
),
onPressed: () {
comp();
},
),
SizedBox(
height: 10,
),
RaisedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Convert()),
);
},
child: Text(
'Next',
style: TextStyle(color: Colors.blue),
),
),
//Text(result),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
return showDialog(
context: context,
barrierDismissible: true,
builder: (context) {
return SimpleDialog(
title: Text("Values"),
// content: TextField(controller: inputvalue1),
children: <Widget>[
SimpleDialogOption(
onPressed: () {
setState(() {
print('Minimum Value= ' + min.toString());
});
},
),
],
);
},
);
// setState(() {
// print('Minimum Value=' + min.toString());
// print('Maximum Value=' + max.toString());
// print('Mid1=' + mid1.toString());
// print('Mid2 =' + mid2.toString());
// });
// Navigator.of(context).pop();
},
),
),
);
}
void comp() {
int value1 =int.parse(inputvalue1.text);
int value2 =int.parse(inputvalue2.text);
int value3 = int.parse(inputvalue3.text);
int value4 =int.parse(inputvalue4.text);
if (value1 == value2||
value1 == value3||
value1 == value4) {
print('Please input different number');
} else if (value2 == value3 ||
value2 == value4) {
print('Please input different number');
} else if (value3== value4) {
print('Please enter differet vlaues');
}
//Finding minimum value
if (value1 <= value2 &&
value1 <= value3 &&
value1 <= value4) {
min = value1;
} else if (value2 <= value3 &&
value2 <= value4) {
min = value2;
} else if (value3 <= value4) {
min = value3;
} else {
min = value4;
}
print('Print the minimun number : $min');
//finding maximum number
if (value1 >= value2&&
value1 >= value2 &&
value1 >= value3 &&
value1 >= value4) {
max = value1;
} else if (value2 >= value3 &&
value2 >= value4) {
max = value2;
} else if (value3 >= value4) {
max = value3;
} else {
max = value4;
}
print('this is the max number : $max');
//finding mid1
if (value1 != min &&
value1!= max) {
mid1 = value1;
} else if (value2 != min &&
value2 != max) {
mid1 = value2;
} else if (value3!= min &&
value3 != max) {
mid1 = value3;
} else if (value4 != min &&
value4 != max) {
mid1 = value4;
}
print('This is the mid value $mid1');
//finding mid2
if (value1 != mid1 &&
value1 != min &&
value1 != max) {
mid2 = value1;
} else if (value2 != mid1 &&
value2 != min &&
value2!= max) {
mid2 =value2;
} else if (value3 != mid1 &&
value3 != min &&
value3 != max) {
mid2 = value3;
} else if (value4 != mid1 &&
value4 != min &&
value4 != max) {
mid2 = value4;
}
print('This is the mid 2 $mid2');
if (mid1 > mid2) {
temp = mid1;
mid1 = mid2;
mid2 = temp;
}
}
}
如果有用请告诉我
关于flutter - 类型 'TextEditingController' 不是类型转换中类型 'int' 的子类型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60785956/