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What is the difference between #import and #include in Objective-C?可能重复：Objective-C中#import和#include有什么区别？
It seems both can work when I use import or include in Objective-C, what's the difference between those two?
当我使用import或包含在Objective-C中时，它们似乎都可以工作，这两者之间有什么区别？
1 个解决方案
#1
2
..#include and #import request that the preprocessor read a file and add it to its output. The difference between #include and #import is that
.. #include和#import请求预处理器读取文件并将其添加到其输出中。 #include和#import之间的区别在于
- #include allow you to include the same file many times.
- #include允许您多次包含同一文件。
- #import ensures that the preprocessor only includes a file once.
- #import确保预处理器只包含一次文件。
C programmers tend to use #include. Objective-C programmers tend to user #import.
C程序员倾向于使用#include。 Objective-C程序员倾向于使用#import。
Compiling a file in Objective-C is done in two passes. First, the preprocessor runs through the file. The output from the preprocessor goes into the real compiler. Preprocessor directives start with #. The three most popular are
在Objective-C中编译文件分两次完成。首先，预处理器运行该文件。预处理器的输出进入真正的编译器。预处理程序指令以＃开头。三个最受欢迎的是
-#include
-＃包括
-#import
-＃进口
-#define
- ＃定义
#1
2
..#include and #import request that the preprocessor read a file and add it to its output. The difference between #include and #import is that
.. #include和#import请求预处理器读取文件并将其添加到其输出中。 #include和#import之间的区别在于
- #include allow you to include the same file many times.
- #include允许您多次包含同一文件。
- #import ensures that the preprocessor only includes a file once.
- #import确保预处理器只包含一次文件。
C programmers tend to use #include. Objective-C programmers tend to user #import.
C程序员倾向于使用#include。 Objective-C程序员倾向于使用#import。
Compiling a file in Objective-C is done in two passes. First, the preprocessor runs through the file. The output from the preprocessor goes into the real compiler. Preprocessor directives start with #. The three most popular are
在Objective-C中编译文件分两次完成。首先，预处理器运行该文件。预处理器的输出进入真正的编译器。预处理程序指令以＃开头。三个最受欢迎的是
-#include
-＃包括
-#import
-＃进口
-#define
- ＃定义