How to to import headers automatically in xcode

Question

Is there any way to import a common header for whole project only once? The idea is place on that header the #defines that will enable/disable functionalities.

I do not want to write #import "common.h" on every .m file.

Write down your header in .pch file ...it will be global for whole project.. — Arvind Kumar, Jan 14 '15 at 15:15
The question is clear. A common automatic header for putting GLOBAL defines For other use, is not recommended at all. — Javier Calatrava Llavería, Jan 14 '15 at 15:41
This is very useful when you want to create with the same base of software different products enabling/disabling some of its features. You have a common place where to set the #defines and you do not have to worry about import the header that has the #define — Javier Calatrava Llavería, Jan 15 '15 at 10:14

score 0 · Answer 1 · answered Jan 14 '15 at 15:10

Yes, it is. Add your common file to the project:

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Then edit the .pch file from your project and import your common.h file:

#ifdef __OBJC__
...
    #import "Common.h"
#endif

Finally the Common.h you can place the #defines:

#define FEATURE_A 0
#define FEATURE_B 1

ALL the stuff that you put in Common.h will be loaded automatically on your project.

score 0 · Answer 2 · edited May 23 '17 at 12:13

0

Prefix headers are commonly used for this purpose; although some advocate against using them.

Reference: What is Prefix.pch file in Xcode?, http://qualitycoding.org/precompiled-headers/

edited May 23 '17 at 12:13

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answered Jan 14 '15 at 15:14

p0lAris

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I advocate use them, ONLY AND ONLY IF, you put in them global #defines. – Javier Calatrava Llavería Jan 14 '15 at 15:35

score 0 · Answer 3 · answered Jan 14 '15 at 15:15

Follow Javier's answer, but you probably also need to create and set up your pch file now, as xcode doesn't automatically create it anymore. To do so, create a new file, select Other under iOS, and select PCH File. Name it ProjectNamePrefix.pch where ProjectName is your project's name.

Then after you create it, you need to go to your build settings, search for prefix. And under the section Apple LLVM 6.0 - Language you'll see a section called Prefix Header. Make the value of the file name you just created. Build, and your good.

Anything you import or define in this file will be available in all of your files

How to to import headers automatically in xcode

3 Answers3