Question

game.h file

@interface ViewController : UIViewController
{
  UIImageView * player;
}

@end

game.m

-(void)InitPlayer
{    
  player.tag = 0;
}

player.m

I want InitPlayer in this file instead but keep declaration in game.h file.

- (void)InitPlayer
{
  player.tag = 0;  // access UIImageView *player;

}

Is this possible to do?

Thanks

Answer 1

just use this to declare -InitPlayer part of your class’ public interface:

@interface ViewController : UIViewController
{
@private
  UIImageView * player;
}

- (void)InitPlayer;

@end

then you keep your implementation of -InitPlayer in ViewController.m, where it must reside. You cannot place the method’s implementation inside an @interface block.

if you are coming from other languages, then you should know that dispatch in objc is dynamic — placing a definition in the header (if it were possible) would not result in an inlined/optimization.

In response to the clarified question:

Ok, then just do this:

Player.h

@interface Player : NSObject
- (void)prepareUIImageView:(UIImageView *)pImageView; // << could actually be a class method in this case
@end

Player.m

@implementation Player

- (void)prepareUIImageView:(UIImageView *)pImageView
{
    pImageView.tag = 0;
}

@end

then you can tell the Player to initialize the view from the ViewController, assuming it has no controller itself.

(note: objc methods names typically begin with a lowercase character. as well, it’s usually a good idea to hide this initialization stuff from your clients)