为什么 TextFormField 不工作并且键盘不显示在 android 工作室的 iphone 模拟器上

Question

注意！！这适用于 google 像素模拟器和我个人的 Android phone

所以我正在为身份验证屏幕创建一个表单。我正在 android 工作室中设置 UI，当我遇到这个障碍时，只是想获得一个简单的表格。出于某种原因，呈现了 iPhone TextFormField，它的验证器也可以工作，但表单本身会产生此错误：

======== Exception caught by services library ======================================================
The following WhosebugError was thrown during a platform message callback:
Stack Overflow

When the exception was thrown, this was the stack: 
#0      _StringBase._interpolate (dart:core-patch/string_patch.dart:837:3)
#1      Duration.toString (dart:core/duration.dart:275:25)
#2      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#3      Duration.toString (dart:core/duration.dart:275:25)
#4      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#5      Duration.toString (dart:core/duration.dart:275:25)
#6      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#7      Duration.toString (dart:core/duration.dart:275:25)
#8      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#9      Duration.toString (dart:core/duration.dart:275:25)
#10     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#11     Duration.toString (dart:core/duration.dart:275:25)
#12     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#13     Duration.toString (dart:core/duration.dart:275:25)
#14     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#15     Duration.toString (dart:core/duration.dart:275:25)
#16     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#17     Duration.toString (dart:core/duration.dart:275:25)
#18     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#19     Duration.toString (dart:core/duration.dart:275:25)
#20     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#21     Duration.toString (dart:core/duration.dart:275:25)
#22     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#23     Duration.toString (dart:core/duration.dart:275:25)
#24     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#25     Duration.toString (dart:core/duration.dart:275:25)
#26     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#27     Duration.toString (dart:core/duration.dart:275:25)
#28     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#29     Duration.toString (dart:core/duration.dart:275:25)
#30     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#31     Duration.toString (dart:core/duration.dart:275:25)
#32     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#33     Duration.toString (dart:core/duration.dart:275:25)
#34     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#35     Duration.toString (dart:core/duration.dart:275:25)
#36     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#37     Duration.toString (dart:core/duration.dart:275:25)
#38     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#39     Duration.toString (dart:core/duration.dart:275:25)
#40     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#41     Duration.toString (dart:core/duration.dart:275:25)
#42     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#43     Duration.toString (dart:core/duration.dart:275:25)
...
...
#4513   Duration.toString (dart:core/duration.dart:275:25)
#4514   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4515   Duration.toString (dart:core/duration.dart:275:25)
#4516   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4517   Duration.toString (dart:core/duration.dart:275:25)
#4518   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4519   Duration.toString (dart:core/duration.dart:275:25)
#4520   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4521   Duration.toString (dart:core/duration.dart:275:25)
#4522   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4523   Duration.toString (dart:core/duration.dart:275:25)
#4524   DiagnosticsProperty.valueToString (package:flutter/src/foundation/diagnostics.dart:2741:60)
#4525   DiagnosticsProperty.toDescription (package:flutter/src/foundation/diagnostics.dart:2755:21)
#4526   TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1194:32)
#4527   TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1126:14)
#4528   TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1304:39)
#4529   TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1126:14)
#4530   DiagnosticsNode.toStringDeep.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1744:9)
#4531   DiagnosticsNode.toStringDeep (package:flutter/src/foundation/diagnostics.dart:1751:6)
#4532   DiagnosticsNode.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1661:18)
#4533   DiagnosticsNode.toString (package:flutter/src/foundation/diagnostics.dart:1673:6)
#4534   Diagnosticable.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:3111:78)
#4535   Diagnosticable.toString (package:flutter/src/foundation/diagnostics.dart:3113:6)
#4536   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4537   HardwareKeyboard._assertEventIsRegular.<anonymous closure> (package:flutter/src/services/hardware_keyboard.dart:437:60)
#4538   HardwareKeyboard._assertEventIsRegular (package:flutter/src/services/hardware_keyboard.dart:452:6)
#4539   HardwareKeyboard.handleKeyEvent (package:flutter/src/services/hardware_keyboard.dart:543:5)
#4540   KeyEventManager.handleRawKeyMessage (package:flutter/src/services/hardware_keyboard.dart:821:35)
#4541   BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:73:49)
#4542   BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:72:47)
#4543   _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:379:35)
#4544   _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:376:46)
#4545   _invoke2.<anonymous closure> (dart:ui/hooks.dart:205:15)
#4548   _invoke2 (dart:ui/hooks.dart:204:10)
#4549   _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:42:5)
#4550   _Channel.push (dart:ui/channel_buffers.dart:132:31)
#4551   ChannelBuffers.push (dart:ui/channel_buffers.dart:329:17)
#4552   PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:544:22)
#4553   _dispatchPlatformMessage (dart:ui/hooks.dart:92:31)
(elided 2 frames from dart:async)
====================================================================================================

======== Exception caught by services library ======================================================
The following WhosebugError was thrown during a platform message callback:
Stack Overflow

When the exception was thrown, this was the stack: 
#0      _StringBase._interpolate (dart:core-patch/string_patch.dart:837:3)
#1      Duration.toString (dart:core/duration.dart:275:25)
#2      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#3      Duration.toString (dart:core/duration.dart:275:25)
#4      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#5      Duration.toString (dart:core/duration.dart:275:25)
#6      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#7      Duration.toString (dart:core/duration.dart:275:25)
#8      _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#9      Duration.toString (dart:core/duration.dart:275:25)
#10     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#11     Duration.toString (dart:core/duration.dart:275:25)
#12     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#13     Duration.toString (dart:core/duration.dart:275:25)
#14     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#15     Duration.toString (dart:core/duration.dart:275:25)
#16     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#17     Duration.toString (dart:core/duration.dart:275:25)
#18     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#19     Duration.toString (dart:core/duration.dart:275:25)
#20     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#21     Duration.toString (dart:core/duration.dart:275:25)
#22     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#23     Duration.toString (dart:core/duration.dart:275:25)
#24     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#25     Duration.toString (dart:core/duration.dart:275:25)
#26     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#27     Duration.toString (dart:core/duration.dart:275:25)
#28     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#29     Duration.toString (dart:core/duration.dart:275:25)
#30     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#31     Duration.toString (dart:core/duration.dart:275:25)
#32     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#33     Duration.toString (dart:core/duration.dart:275:25)
#34     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#35     Duration.toString (dart:core/duration.dart:275:25)
#36     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#37     Duration.toString (dart:core/duration.dart:275:25)
#38     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#39     Duration.toString (dart:core/duration.dart:275:25)
#40     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#41     Duration.toString (dart:core/duration.dart:275:25)
#42     _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#43     Duration.toString (dart:core/duration.dart:275:25)
...
...
#4513   Duration.toString (dart:core/duration.dart:275:25)
#4514   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4515   Duration.toString (dart:core/duration.dart:275:25)
#4516   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4517   Duration.toString (dart:core/duration.dart:275:25)
#4518   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4519   Duration.toString (dart:core/duration.dart:275:25)
#4520   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4521   Duration.toString (dart:core/duration.dart:275:25)
#4522   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4523   Duration.toString (dart:core/duration.dart:275:25)
#4524   DiagnosticsProperty.valueToString (package:flutter/src/foundation/diagnostics.dart:2741:60)
#4525   DiagnosticsProperty.toDescription (package:flutter/src/foundation/diagnostics.dart:2755:21)
#4526   TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1194:32)
#4527   TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1126:14)
#4528   TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1304:39)
#4529   TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1126:14)
#4530   DiagnosticsNode.toStringDeep.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1744:9)
#4531   DiagnosticsNode.toStringDeep (package:flutter/src/foundation/diagnostics.dart:1751:6)
#4532   DiagnosticsNode.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1661:18)
#4533   DiagnosticsNode.toString (package:flutter/src/foundation/diagnostics.dart:1673:6)
#4534   Diagnosticable.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:3111:78)
#4535   Diagnosticable.toString (package:flutter/src/foundation/diagnostics.dart:3113:6)
#4536   _StringBase._interpolate (dart:core-patch/string_patch.dart:846:19)
#4537   HardwareKeyboard._assertEventIsRegular.<anonymous closure> (package:flutter/src/services/hardware_keyboard.dart:437:60)
#4538   HardwareKeyboard._assertEventIsRegular (package:flutter/src/services/hardware_keyboard.dart:452:6)
#4539   HardwareKeyboard.handleKeyEvent (package:flutter/src/services/hardware_keyboard.dart:543:5)
#4540   KeyEventManager.handleRawKeyMessage (package:flutter/src/services/hardware_keyboard.dart:821:35)
#4541   BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:73:49)
#4542   BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:72:47)
#4543   _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:379:35)
#4544   _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:376:46)
#4545   _invoke2.<anonymous closure> (dart:ui/hooks.dart:205:15)
#4548   _invoke2 (dart:ui/hooks.dart:204:10)
#4549   _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:42:5)
#4550   _Channel.push (dart:ui/channel_buffers.dart:132:31)
#4551   ChannelBuffers.push (dart:ui/channel_buffers.dart:329:17)
#4552   PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:544:22)
#4553   _dispatchPlatformMessage (dart:ui/hooks.dart:92:31)
(elided 2 frames from dart:async)
====================================================================================================

我已经多次重新启动我的项目，但错误仍然存在。有人可以帮我解决这个问题吗？

这是我的代码：

final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: const Text(
          "Login",
        ),
      ),
      body: Form(
        key: _formKey,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            TextFormField(
              keyboardType: TextInputType.text,
              decoration: const InputDecoration(
                hintText: 'Enter your email',
              ),
              validator: (String? value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter some text';
                }
                return null;
              },
            ),
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 16.0),
              child: ElevatedButton(
                onPressed: () {
                  // Validate will return true if the form is valid, or false if
                  // the form is invalid.
                  if (_formKey.currentState!.validate()) {
                    // Process data.
                  }
                },
                child: const Text('Submit'),
              ),
            ),
          ],
        ),
      )
    );
  }

Answer 1

切换到Flutter稳定版解决问题

flutter channel stable

此外，确保通过运行此命令

升级到最新版本的Flutter

flutter upgrade

谢谢

为什么 TextFormField 不工作并且键盘不显示在 android 工作室的 iphone 模拟器上

Why is TextFormField Not work and Keyboard not showing on iphone simulator in android studio

textfield

dart

flutter-textformfield

注意！！这适用于 google 像素模拟器和我个人的 Android phone