#import< UIKit / UIKit.h>在pch减慢编译时间？ [英] Does #import <UIKit/UIKit.h> on pch slow down the compile time?

问题描述

我正在阅读有关进口的帖子，我有一个问题。默认情况下，prefix.pch文件中的#import是否会减慢编译时间？我应该删除它并仅在必要时导入吗？

I was reading this post about imports and I had one question. Does the #import that comes in the prefix.pch file by default slow down the compile time? Should I remove it and import only when necessary?

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
#endif

推荐答案

不。它实际上提高了编译速度。

No. It actually improves the compilation speed.

这是一个很好的教程，实际上清除了使用#import语句和.PCH文件的所有困惑。它还会详细告诉你iOS7中引入的一些新的模块。

This is a nice tutorial that actually clears all the confusion over use of #import statements and .PCH files. Also it tells you in detail about something new known as "modules", introduced in iOS7.

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