@interface MyScrollView : UIView {
@private
    id <MyScrollViewDelegate> _delegate;
    id <MyScrollViewDataSource> _dataSource;

    UIScrollView *_scrollView;
    NSMutableArray *_contentViews; // you need to create/maintain/reuse contentView from here
}

@property (nonatomic, assign) id <MyScrollViewDelegate> delegate;
@property (nonatomic, assign) id <MyScrollViewDataSource> dataSource;
@end

@protocol MyScrollViewDataSource <NSObject>
@optional
- (NSString *)myScrollView:(MyScrollView *)myScrollView requestTitleForContentViewAtIndex:(NSInteger)index;
- (UIImage *)myScrollView:(MyScrollView *)myScrollView requestLogoForContentViewAtIndex:(NSInteger)index;
@end

...