小编aja*_*ole的帖子

非抽象类“InternalSelectableMathState”缺少这些成员的实现

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.3.3/lib/src/widgets/selectable.dart:407:7：错误：非抽象类“InternalSelectableMathState” ' 缺少这些成员的实现：

TextSelectionDelegate.copySelection
TextSelectionDelegate.cutSelection
TextSelectionDelegate.pasteText
TextSelectionDelegate.selectAll 尝试任一
提供一个实现，
从超类或 mixin 继承实现，
将类标记为抽象类，或者
提供“noSuchMethod”实现。

类InternalSelectableMathState扩展状态^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/services/text_input .dart:985:8：上下文：“TextSelectionDelegate.copySelection”在此处定义。void copySelection(SelectionChangedCause 原因); ^^^^^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/services/text_input.dart:965:8: 上下文：'TextSelectionDelegate.cutSelection' 在这里定义。无效cutSelection（SelectionChangedCause原因）；^^^^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/services/text_input.dart:973:16：上下文：'TextSelectionDelegate.pasteText'在这里定义。未来的pasteText（SelectionChangedCause原因）；^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/services/text_input.dart:979:8：上下文：'TextSelectionDelegate.selectAll'在这里定义。void selectAll(SelectionChangedCause 原因); ^^^^^^^^^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_datetime_picker-1.5.1/lib/flutter_datetime_picker.dart:311:32：警告：操作数空感知操作'??' 具有排除 null 的“Color”类型。

“颜色”来自“dart:ui”。颜色：主题.背景颜色？Colors.white，^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.1.0/lib/src/widget/button.dart:200:14：错误：'AnimatedScale ' 是从 'package:flutter/src/widgets/implicit_animations.dart' 和 'package:flutter_neumorphic/src/widget/animation/animated_scale.dart' 导入的。子：AnimatedScale( ^^^^^^^^^^^^^^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.1.0/lib/src/widget/ switch.dart：167：20：错误：“AnimatedScale”是从“package：flutter/src/widgets/implicit_animations.dart”和“package：flutter_neumorphic/src/widget/animation/animated_scale.dart”导入的。child：AnimatedScale (^^^^^^^^^^^^^^

失败：构建失败并出现异常。