A demo of UIViewController-like class (PageViewController)

PageViewController.h

#import <UIKit/UIKit.h>

@class PageInfo;

@protocol PageViewControllerDelegate;


@interface PageViewController : NSObject {
	NSInteger pageIndex;
	id<PageViewControllerDelegate> delegate;
	PageInfo *pageData;

	NSString *_nibName;

    // for "sliding message"
    UIView  *_messageView;
    UILabel *_sectionEndStarLabel;
    UILabel *_sectionEndMessageLabel;
    UILabel *_titleLabel;
    UILabel *_messageLabel;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;

@property(nonatomic) NSInteger pageIndex;
@property(nonatomic, assign) id<PageViewControllerDelegate> delegate;
@property(nonatomic, retain) PageInfo *pageData;

@property(nonatomic, retain) IBOutlet UIView *view;

- (void)loadView;
- (void)viewDidLoad;
- (void)viewDidUnload;
- (void)didReceiveMemoryWarning;
- (void)viewWillAppear:(BOOL)animated;
- (void)viewWillDisappear:(BOOL)animated;
- (void)viewDidAppear:(BOOL)animated;
- (void)viewDidDisappear:(BOOL)animated;

- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated;
- (void)dismissModalViewControllerAnimated:(BOOL)animated;

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
    
- (void)addSlidingMessageWithTitle:(NSString *)title message:(NSString *)message sectionEnd:(BOOL)sectionEnd;
- (void)layoutSlidingMessageWithContentY:(CGFloat)contentY contentHeight:(CGFloat)contentHeight scaleFactor:(BOOL)scaleFactor;

@end


@protocol PageViewControllerDelegate <NSObject>

- (void)changePage:(int)page iAm:(int)t;

- (void)tocHide;
- (void)tocUnHide;

@end

PageViewController.m

#import "PageViewController.h"


@implementation PageViewController

@synthesize pageIndex;
@synthesize delegate;
@synthesize pageData;
@synthesize view=_view;


#pragma mark -
#pragma mark UIViewController emulation

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
	if (self = [super init]) {
		_nibName = [nibNameOrNil copy];
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
	}
	return self;
}

- (UIView *)view {
	if (_view == nil) {
		[self loadView];
        NSAssert(_view != nil, @"self.view not loaded by loadView");
        [self viewDidLoad];
	}
	return _view;
}

- (void)setView:(UIView *)view {
	if (view != _view) {
		[_view release];
		_view = [view retain];
	}
}

- (void)loadView {
    if ([_nibName length] == 0) {
        _nibName = [NSStringFromClass([self class]) retain];
    }
	[[NSBundle mainBundle] loadNibNamed:_nibName owner:self options:nil];
	NSAssert1(_view != nil, @"self.view outlet is not connected in %@", _nibName);
}

- (void)viewDidLoad {
	// to be overridden
}

- (void)viewDidUnload {
	// to be overridden
    [_sectionEndStarLabel release], _sectionEndStarLabel = nil;
    [_sectionEndMessageLabel release], _sectionEndMessageLabel = nil;
    [_titleLabel release], _titleLabel = nil;
    [_messageLabel release], _messageLabel = nil;
}

- (void)didReceiveMemoryWarning {
	if (_view != nil && _view.superview == nil) {
		[_view release], _view = nil;
		[self viewDidUnload];
	}
}

- (void)dealloc {
	[pageData release], pageData = nil;
	delegate = nil;

    [_sectionEndStarLabel release], _sectionEndStarLabel = nil;
    [_sectionEndMessageLabel release], _sectionEndMessageLabel = nil;
    [_titleLabel release], _titleLabel = nil;
    [_messageLabel release], _messageLabel = nil;
    
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
    [_nibName release], _nibName = nil;
    [_view release], _view = nil;
    [super dealloc];
}

- (void)viewWillAppear:(BOOL)animated {
}

- (void)viewWillDisappear:(BOOL)animated {
}

- (void)viewDidAppear:(BOOL)animated {
}

- (void)viewDidDisappear:(BOOL)animated {
}

- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated {
}

- (void)dismissModalViewControllerAnimated:(BOOL)animated {
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}

@end