Sorry for my English, let speak from my heart :)
In one project which I work, I noticed an interesting moment. 

In \*.h file declared interface: 

```
@interface FrontViewController : UIViewController
...
@end

```

And in \*.m file I found another interface. 

```
@interface FrontViewController()

// Private Properties:
@property (retain, nonatomic) UIPanGestureRecognizer *navigationBarPanGestureRecognizer;

// Private Methods:
- (IBAction)pushExample:(id)sender;

@end

@implementation FrontViewController
...
@end

```

Why is it needed? And what's the point? -I think that this is for convenience. Yes?