问题描述
Xcode 项目自动生成 Prefix.pch 文件.当我删除此文件并尝试构建时，我收到构建错误，提示*_Prefix.pch"文件丢失.
The Xcode project generates Prefix.pch file automatically. When I deleted this file and tried to build, I got build error saying '*_Prefix.pch' file is missing.
- 是否必须使用 Prefix.pch 文件才能使用 Xcode 进行编译?
- 如何在没有 Prefix.pch 文件的情况下进行构建?
推荐答案
在 Xcode 中，转到目标的构建设置(Command-Option-E，构建选项卡)并取消选中 Precompile Prefix Header (GCC_PRECOMPILE_PREFIX_HEADER).如果需要，您还可以删除 Prefix Header 设置的值.
In Xcode, go to your target's build settings (Command-Option-E, build tab) and uncheck Precompile Prefix Header (GCC_PRECOMPILE_PREFIX_HEADER). You can also remove the value of the Prefix Header setting if you wish.
前缀头被编译并存储在缓存中，然后在编译期间自动包含在每个文件中.这可以加快编译速度，并让您包含一个文件，而无需向使用它的每个文件添加导入语句.它们不是必需的，而且在您更改它们时实际上会减慢编译速度.
Prefix headers are compiled and stored in a cache, and then automatically included in every file during compilation. This can speed up compilation, and lets you include a file without adding an import statement to every file using it. They are not required, and actually slow compilation whenever you change them.
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