Question

I have a problem with protocols. I have a class like this :

@class SideToolBarDelegate;
@interface AuthentificationViewController : UIViewController <ASIHTTPRequestDelegate, UITextFieldDelegate,SideToolBarDelegate> {
}
...

I would like that my class “AuthentificationViewController” conforms to the protocol “SideToolBarDelegate” just i am in the iPhone version and not to conform it i am in the iPad version. How i can declare this ? thanks.

Answer 1

You can make some defins set in project properties and use ifdefs. Like:

@interface AuthentificationViewController : UIViewController <ASIHTTPRequestDelegate, UITextFieldDelegate
#ifdef IPAD
,SideToolBarDelegate>
#else
>
#endif

But this is old C way. It is a very bad idea to do this in program conforming to Object Oriented Application Design. In this case you have two more ways:

1. make separate subclasses for iPhone and iPad
2. make this one class as is and dont use SideToolBarDelegate methods from iPhone. This makes code clear and better to maintain in the future.

After all I suggest making two classes for viewControllers:

AuthentificationiPadViewController : UIViewController <ASIHTTPRequestDelegate, UITextFieldDelegate>
AuthentificationiPhoneViewController : UIViewController <ASIHTTPRequestDelegate, UITextFieldDelegate, SideToolBarDelegate>

Just think of future debugging of your code!