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用于条件编译的符号?

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可用于所有文件的符号，而不必使用import/include，以便一组通用类在某些项目中可以具有特殊的行为.类似于以下内容，但带有我自己的符号.

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

转到目标"或项目"设置，单击左下方的Gear图标，然后选择添加用户定义的设置".新的设置名称应为GCC_PREPROCESSOR_DEFINITIONS，您可以在右侧字段中输入定义.

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.

按照Steph的评论，完整语法为:

Per Steph's comments, the full syntax is:

constant_1=VALUE constant_2=VALUE

请注意，如果您只是想#define一个符号而不是给它一个值(对于#ifdef语句)，则不需要

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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