I suppose the class have several different interfaces. Some it shows to some class, some it shows to other classes.

Are there any good reason for that?

One thing I can think of is with one .h per class, interface would either be public or private.

What about if I want some interface to be available to some friends' class and some interface to be truly public?

Sample:

@interface listNewController:BadgerStandardViewViewController <UITableViewDelegate,UITableViewDataSource,UITextFieldDelegate,NSFetchedResultsControllerDelegate,UIScrollViewDelegate,UIGestureRecognizerDelegate> {
}

@property (nonatomic) IBOutlet NSFetchedResultsController *FetchController;
@property (nonatomic) IBOutlet UITextField *searchBar1;
@property (nonatomic) IBOutlet UITableView *tableViewA;
+ (listNewController *) singleton; //For Easier Access
-(void)collapseAll;
-(void)TitleViewClicked:(TitleView *) theTitleView;
-(NSUInteger) countOfEachSection:(NSInteger)section;
@end

Many of those public properties and function are only ever called by just one other classes. I wonder why I need to make them available to many classes.

It's in Objective-c by the way