ios - Objective-C return subclass based on Xcode project target? -

i have xcode project compile 2 targets, sake of simplicity we'll call them 'foo' , 'bar'. have superclass , 2 subclasses, how can cleanly ensure variable returned different subclass based on project target?

so example, have following...

viewmanager.h //super class fooviewmanager.h //foo subclass barviewmanager.h //bar subclass  ...  viewmanager * viewmanager;  #if target_foo      viewmanager = [[fooviewmanager alloc] init];  #elif target_bar      viewmanager = [[barviewmanager alloc] init];  #else      viewmanager = [[viewmanager alloc] init];  #endif  ... 

is there way can make code cleaner, in caller class dont need compiler #if statements, , have initialize superclass, , maybe superclass init method can take care of switching based on current project target, , return correct subclass within viewmanager variable?

i'm sure there's standard pattern doing in objective-c i'm missing, appreciated!

it possible locate required subclass definition in 1 place, i.e., make define once , use on places:

#if defined(target_foo)     #define currentviewmanager fooviewmanager #elif defined(target_bar)     #define currentviewmanager barviewmanager #else     #define currentviewmanager viewmanager #endif 

and use new define everywhere without preprocessor macros:

currentviewmanager *manager = [[currentviewmanager alloc] init]; 

probably find useful incapsulate logic in fabric method:

+ (viewmanager *)createviewmanager {     // preprocessor switches here     // ...      return [[currentviewmanager alloc] init]; }