错误：在我的项目中导入颜色选择器包时，方法“AlwaysWinPanGestureRecognizer...”的参数“事件”

Posted 2023-02-23

【中文标题】错误：在我的项目中导入颜色选择器包时，方法“AlwaysWinPanGestureRecognizer...”的参数“事件”

【英文标题】：Error: The parameter 'event' of the method 'AlwaysWinPanGestureRecognizer... when importing color picker package in my project

【发布时间】：2021-09-02 09:57:44

【问题描述】：

欢迎 我在导入 flutter_colorpicker package 时遇到问题 当我将它导入我的项目时： import 'package:flutter_colorpicker/flutter_colorpicker.dart'; 我收到此错误：

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_colorpicker-0.5.0/lib/src/hsv_picker.dart:730:43: Error: The parameter 'event' of the method 'AlwaysWinPanGestureRecognizer.addAllowedPointer' has type 'PointerDownEvent', which does not match the corresponding type, 'PointerEvent', in the overridden method, 'DragGestureRecognizer.addAllowedPointer'.
 - 'PointerDownEvent' is from 'package:flutter/src/gestures/events.dart' ('/C:/src/flutter/packages/flutter/lib/src/gestures/events.dart').
 - 'PointerEvent' is from 'package:flutter/src/gestures/events.dart' ('/C:/src/flutter/packages/flutter/lib/src/gestures/events.dart').
Change to a supertype of 'PointerEvent', or, for a covariant parameter, a subtype.
  void addAllowedPointer(PointerDownEvent event) 
                                          ^
/C:/src/flutter/packages/flutter/lib/src/gestures/monodrag.dart:256:8: Context: This is the overridden method ('addAllowedPointer').
  void addAllowedPointer(PointerEvent event) 
       ^

这是颤振医生的结果：

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.2.1, on Microsoft Windows [Version 10.0.17763.1577], locale en-US)
[√] android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Chrome - develop for the web
[√] Android Studio (version 3.6)
[√] IntelliJ IDEA Community Edition (version 2021.1)
[√] VS Code (version 1.56.2)
[√] Connected device (3 available)

• No issues found!

这是项目的依赖：

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^2.0.6
  flutter_colorpicker: ^0.5.0

有人有解决办法吗？ 感谢每一个人

【问题讨论】：

github.com/mchome/flutter_colorpicker/issues/…

【参考方案1】：

只需将 flutter_colorpicker 版本更改为 0.4.0

【讨论】：

更新flutter_colorpicker版本到^0.6.1

【参考方案2】：

一种选择是将协变关键字添加到方法中 addAllowedPointer(协变 PointerEvent 事件)

出现错误，但此选项只能解决您计算机上的问题

【参考方案3】：

这些可能会有所帮助： 将 pubspec.yaml 中的依赖项更改为：

dependencies: 
flutter:
  sdk: flutter
  flutter_colorpicker: ^0.6.0

运行flutter clean，然后再次添加对我有用的依赖项:)