Function library and private function

You can create a function library, for example:

//commonFunction.h

#import

NSString *getDisclaimer;

in the implementation file, can add some private function like this:

//commonFunction.m

#import "commonFunction.h"

//private function declaration
static NSString *addCopyright;

NSString *getDisclaimer{
    ....
}

//private function implementation
static NSString *addCopyright{
    ...
}


Reference: http://rypress.com/tutorials/objective-c/functions.html#function-libraries