如何在 Xcode 中定义预处理器符号 [英] How to define a preprocessor symbol in Xcode

问题描述

是否可以通过在 Xcode 项目中设置属性来设置条件编译的符号?

Is it possible to set a symbol for conditional compilation by setting up properties in an Xcode project?

我的目标是创建一个对所有文件都可用的符号，而不必使用导入/包含，以便一组公共类可以在某些项目中具有特殊行为.像下面这样，但有我自己的符号.

My aim is to to create a symbol that is available to all files, without having to use import/include, so that a set of common classes can have a special behavior in some projects. Like the following, but with my own symbols.

#if TARGET_IPHONE_SIMULATOR
    ...
#endif

推荐答案

转到您的目标或项目设置，单击左下角的齿轮图标，然后选择添加用户定义的设置".新设置名称应为 GCC_PREPROCESSOR_DEFINITIONS，您可以在右侧字段中输入您的定义.

Go to your Target or Project settings, click the Gear icon at the bottom left, and select "Add User-Defined Setting". The new setting name should be GCC_PREPROCESSOR_DEFINITIONS, and you can type your definitions in the right-hand field.

根据 Steph 的评论，完整的语法是:

Per Steph's comments, the full syntax is:

constant_1=VALUE constant_2=VALUE

请注意，如果您只想#define 一个符号，而不是给它一个值(对于 #ifdef 语句)，则不需要 '='s)

Note that you don't need the '='s if you just want to #define a symbol, rather than giving it a value (for #ifdef statements)

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