包含和导入之间的区别 [英] Difference Between includes and imports

问题描述

可能重复：

Objective-C中#import和#include之间有什么区别？

有什么区别

#include< >
#include" "

#import< >
#import" "

推荐答案

#import 指令是 #include 的改进版本。
#import 确保文件只被包含一次，这样你就不会有递归包含的问题。

The #import directive is an improved version of #include. #import ensures that a file is only ever included once so that you never have a problem with recursive includes.

#import首先检查项目文件夹中的标题然后转到系统库，＃import<> 检查系统头。理论上，位置是编译器定义的，它们可以在给定平台上以不同方式实现。

#import "" first check the header in project folder then goes to system library, and the #import<> checks for system headers". In theory the locations are compiler defined and they could be implemented differently on a given platform.

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