本地应用开发

了解如何在使用 Expo 时在本地编译和构建应用。

要使用你的计算机在本地将项目构建为应用，你必须在测试调试版本或创建生产版本以将其提交到应用商店之前手动生成原生代码。你可以通过两种方式在本地构建应用。本指南简要介绍了创建此工作流程所需的方法和其他指南的参考。

¥To build your project into an app locally using your machine, you have to manually generate native code before testing the debug build or creating a production build for it to submit to the app store. There are two ways you can build your app locally. This guide provides a brief introduction to both methods and references to other guides that are necessary to create this workflow.

先决条件

¥Prerequisites

要按照本指南中描述的步骤操作，请参阅下面有关如何设置开发环境的说明。

¥To follow the steps described in this guide, see the instructions below on how to set your development environment.

export JAVA_HOME=/Library/Java/JavaVirtualMachines/zulu-17.jdk/Contents/Home

export JAVA_HOME=/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home

本地应用编译

¥Local app compilation

要在本地构建项目，你可以使用 Expo CLI 中的编译命令来生成 android 和 ios 目录：

¥To build your project locally you can use compile commands from Expo CLI which generates the android and ios directories:

上述命令使用本地安装的 Android SDK 或 Xcode 将你的项目编译为应用的调试版本。

¥The above commands compile your project, using your locally installed Android SDK or Xcode, into a debug build of your app.

• 这些编译命令最初运行 npx expo prebuild 以在构建之前生成原生目录（android 和 ios）（如果它们尚不存在）。如果它们已经存在，这将被跳过。

  ¥These compilation commands initially run npx expo prebuild to generate native directories (android and ios) before building, if they do not exist yet. If they already exist, this will be skipped.

• 你还可以添加 --device 标志来选择运行应用的设备 - 你可以选择物理连接的设备或模拟器/模拟器。

  ¥You can also add the --device flag to select a device to run the app on — you can select a physically connected device or emulator/simulator.

• 你可以传入 --variant release (Android) 或 --configuration Release (iOS) 来构建 你的应用的生产版本。

  ¥You can pass in --variant release (Android) or --configuration Release (iOS) to build a production version of your app.

要在第一次构建后修改项目的配置或原生代码，你必须重新构建项目。再次运行 npx expo prebuild 会将更改分层到现有文件之上。构建后也可能会产生不同的结果。

¥To modify your project's configuration or native code after the first build, you will have to rebuild your project. Running npx expo prebuild again layers the changes on top of existing files. It may also produce different results after the build.

为了避免这种情况，请将原生目录添加到项目的 .gitignore 并使用 npx expo prebuild --clean 命令。这确保了项目始终受到管理，并且 --clean 旗 将在重新生成现有目录之前删除它们。你可以使用 应用配置 或创建 配置插件 来修改原生目录内的项目配置或代码。

¥To avoid this, add native directories to the project's .gitignore and use npx expo prebuild --clean command. This ensures that the project is always managed, and the --clean flag will delete existing directories before regenerating them. You can use app config or create a config plugin to modify your project's configuration or code inside the native directories.

要了解有关编译和预构建如何工作的更多信息，请参阅以下指南：

¥To learn more about how compilation and prebuild works, see the following guides:

使用 expo-dev-client 进行本地构建

¥Local builds with expo-dev-client

如果你将 expo-dev-client 安装到项目中，那么项目的调试版本将包括 expo-dev-client UI 和工具，我们将这些版本称为开发版本。

¥If you install expo-dev-client to your project, then a debug build of your project will include the expo-dev-client UI and tooling, and we call these development builds.

要创建开发版本，你可以使用 本地应用编译 命令 (npx expo run:[android|ios])，这将创建调试版本并启动开发服务器。

¥To create a development build, you can use local app compilation commands (npx expo run:[android|ios]) which will create a debug build and start the development server.

使用 EAS 进行本地构建

¥Local builds with EAS