Question

Hi I am developing iphone/ipad Applications. I took one header.h and import all ViewControllers importing in that header.h. Then i just import header.h in all classes.

Like header.h contains

#import "loginViewController.h"

#import "signupviewController.h"

and i have imported #import header.h in all necessary view-controllers.

if i done like this, any memory issues occurred or not?

I know, in C language, if we done like above, all unnecessary code have to be included, What about in objective-c?

I googled, but i didn’t find the required answer.

please tell any one.

Thanks.

Answer 1

#import keeps track of which headers have already been included and is ignored if a header is imported more than once in a compilation unit.

This makes it unnecessary to use header guards.

The #import line is only replaced by the contents of name file for the first time it is encountered.

The bottom line is just use #import in Objective-C and don’t worry if you are importing headers more than once.
#import ensures that a file is only ever included once so that you never have a problem with recursive includes. But that is not the same case with #include.