pubspec.yaml中的第三方Dart包导致Xcode中找不到致命文件错误（但适用于Android）

Question

我正在运行macOS Mojave的MacBook Pro上开发Android Studio中的Flutter应用程序。该应用程序在Android（模拟器和物理设备）上编译和运行，但无法为iOS（模拟器和物理设备）编译。如果pubspec.yaml中没有引用第三个Dart库，它可以为两个平台编译。

颤动的医生没有显示任何错误。

这是我的pubspec.yaml：

name: yr_school_bus_cancellations
description: York Region School Bus Cancellations

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# Read more about versioning at semver.org.
version: 1.0.0+1

environment:
  sdk: ">=2.0.0-dev.68.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  http: ^0.12.0+1
  html: ^0.13.3+3
  sqflite: ^1.1.0
  path_provider: ^0.5.0+1
  url_launcher: ^5.0.1

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.io/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.io/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.io/custom-fonts/#from-packages

和Xcode中的错误消息：

=== BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test your code with “Use of deprecated Swift 3 @objc inference” logging enabled, and then disable inference by changing the "Swift 3 @objc Inference" build setting to "Default" for the "Runner" target.
=== BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
/Users/josephlam/AndroidStudioProjects/2019/yr_school_bus_cancellations/ios/Runner/GeneratedPluginRegistrant.m:6:9: fatal error: 'path_provider/PathProviderPlugin.h' file not found
#import <path_provider/PathProviderPlugin.h>
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

PathProvider不是导致问题的唯一包。如果我在pubspec.yaml中删除对PathProvider的引用，那么构建将在另一个第三方包（即http，url_launcher，sqflite）上失败。

有谁知道如何解决这个问题？谢谢！

Answer 1

感谢GünterZöchbauer的帮助，以下文章为我解决了这个问题：https://github.com/flutter/flutter/wiki/Workarounds-for-common-issues#generated-project-files-outdated。

以下是文章内容的复制：

当使用flutter create foo创建项目时，会在ios /和android /子目录中创建几个文件。

较新的Flutter版本可能会稍微不同地生成这些文件，使用较旧的Flutter版本创建的项目可能会导致问题。

• 删除ios /和android /目录并运行flutter create。重新生成这些目录。

自定义更改将丢失，需要重新应用。如果项目提交到像Git这样的版本控制系统，这是最简单的。