设置目标的构建设置如下：

Set the target's build settings as follows:

GCC_PRECOMPILE_PREFIX_HEADER=YES
GCC_PREFIX_HEADER="Prefix.pch"

请注意，如果您更喜欢使用Xcode的UI，可以在Build Settings搜索字段中填写这些键。你的构建设置。

Note that you can plop these keys in the Build Settings search field, if you prefer to use Xcode's UI for your build settings.