我正在尝试使用StatefulWidget创建路由。
错误：
I/flutter (23141): ??? EXCEPTION CAUGHT BY WIDGETS LIBRARY ????????????????????????????????????????????????????????????
I/flutter (23141): The following assertion was thrown building
I/flutter (23141): _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#3e9ee](dirty, state: _OverlayEntryState#7b90c):
I/flutter (23141): The builder for route "/" returned null.
I/flutter (23141): Route builders must never return null.
码：
routes:<String,WidgetBuilder>{
"/":(_)=>new RouteHome(title: 'Flutter Demo Home Page'),
...
I/flutter (23141): ??? EXCEPTION CAUGHT BY WIDGETS LIBRARY ????????????????????????????????????????????????????????????
I/flutter (23141): The following assertion was thrown building
I/flutter (23141): _OverlayEntry-[LabeledGlobalKey<_OverlayEntryState>#3e9ee](dirty, state: _OverlayEntryState#7b90c):
I/flutter (23141): The builder for route "/" returned …flutter doctor 有问题 -
Oops; flutter has exited unexpectedly.
Sending crash report to Google.
Crash report sent (report ID: a5fb11a50ca9bb90)
Unhandled exception:
NoSuchMethodError: The getter 'isMacOS' was called on null.
Receiver: null
Tried calling: isMacOS
#0 Object.noSuchMethod (dart:core-patch/dart:core/object_patch.dart:46)
#1 IOSDevices.supportsPlatform (package:flutter_tools/src/ios/devices.dart:34)
#2 DeviceManager._platformDiscoverers.<anonymous closure> (package:flutter_tools/src/device.dart:85)
#3 WhereIterator.moveNext (dart:_internal/iterable.dart:439)
这似乎是颤振的错误。（我不完全知道我做了什么，所以无法帮助重现它，但我被这个问题困住了。重新安装 flutter 也没有帮助。）
我正在尝试对平台签入进行硬编码ios/devices.dart，因为我在 Windows 上为 android 开发。
但我的改变 - `
@override
bool get supportsPlatform {
return false;
` 没有影响。
flutter doctor 仍然在相同的行号处抛出相同的错误。