如何修复Flutter添加Rive动画后Mat2D隐式复制赋值运算符已弃用错误？

添加Rive动画到Flutter应用启动页后，Windows编译出现以下错误：

C:\Users\d\Desktop\Flutter Real Projects\weather_app\windows\flutter\ephemeral.plugin_symlinks\rive_common\windows..\ios\rive-cpp\include\rive/math/mat2d.hpp(17,5): error : definition of implicit copy assignment operator for 'Mat2D' is deprecated because it has a user-declared copy constructor [-Werror,-Wdeprecated-copy] [C:\Users\d\Desktop\Flutter Real Projects\weather_app\build\windows\plugins\rive_common\rive_common_plugin.vcxproj]
Exception: Build process failed.

使用的启动页代码如下：

import 'package:animated_splash_screen/animated_splash_screen.dart';
import 'package:flutter/material.dart';
import 'package:rive/rive.dart';
import 'package:weather_app/pages/home_page.dart';


class Splash extends StatelessWidget {
  const Splash({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.red,
      child: AnimatedSplashScreen(
        splashTransition: SplashTransition.fadeTransition,
        backgroundColor: Colors.amber,
        splash: const RiveAnimation.asset('assets/images/anim.riv'),
        nextScreen: const HomePage(),
      ),
    );
  }
}

解决方案 #

• 升级Rive依赖版本：这个报错是rive-cpp底层的编译警告被触发为错误，新版本的rive包已经修复了该问题。在pubspec.yaml中将rive依赖更新到最新稳定版，示例：

  dependencies:
    rive: ^0.12.0 # 替换为当前最新稳定版本
  

  执行flutter pub get更新依赖后重新编译。

• 禁用Windows编译的-Wdeprecated-copy警告：如果暂时无法升级依赖，可修改Windows项目的编译配置忽略该警告：

  1. 打开项目路径下的build/windows/plugins/rive_common/rive_common_plugin.vcxproj文件
  2. 在<ClCompile>节点中添加忽略警告的参数，修改后示例：

     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <AdditionalOptions>$(AdditionalOptions) -Wno-deprecated-copy</AdditionalOptions>
     </ClCompile>
     

  3. 保存文件后重新执行flutter run -d windows

• 替换启动页实现方式：若上述方法无效，可弃用animated_splash_screen包，手动实现Rive动画启动页跳转，避免潜在冲突：

  import 'package:flutter/material.dart';
  import 'package:rive/rive.dart';
  import 'package:weather_app/pages/home_page.dart';
  
  class Splash extends StatefulWidget {
    const Splash({super.key});
  
    @override
    State<Splash> createState() => _SplashState();
  }
  
  class _SplashState extends State<Splash> {
    @override
    void initState() {
      super.initState();
      // 可根据动画播放状态调整跳转时机，这里用固定延迟示例
      Future.delayed(const Duration(seconds: 3), () {
        Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const HomePage()));
      });
    }
  
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        backgroundColor: Colors.amber,
        body: Center(
          child: RiveAnimation.asset('assets/images/anim.riv'),
        ),
      );
    }
  }
  

内容的提问来源于stack exchange，提问作者borhanedine