Question

I would like to understand the process of the declaration of a button.

@interface MerdaViewController : UIViewController{    
    IBOutlet UIButton *button;
}

@property (retain, nonatomic) IBOutlet UIButton *button;

@end

Why do we need those steps?

Is it always required?

Thank you so much.

Alex.

Answer 1

To create a button outlet you just need this line.

@property (retain, nonatomic) IBOutlet UIButton *button;

To create button action

-(IBAction)doSomething:(id)sender;

Just like to add another point:

Outlets should generally be weak/assign, except for those from File’s Owner to top-level objects in a nib file (or, in iOS, a storyboard scene) which should be strong/retain