MPMusicPlayerController	*musicPlayer = [MPMusicPlayerController iPodMusicPlayer];

#define HORIZ_SWIPE_DRAG_MIN 100
CGPoint mystartTouchPosition;
BOOL isProcessingListMove;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
	UITouch *touch = [touches anyObject];
	CGPoint newTouchPosition = [touch locationInView:self.view];
	if(mystartTouchPosition.x != newTouchPosition.x || mystartTouchPosition.y != newTouchPosition.y) {
		isProcessingListMove = NO;
	}
	mystartTouchPosition = [touch locationInView:self.view];
	[super touchesBegan:touches withEvent:event];
	[[self.wv.subviews objectAtIndex:0] touchesBegan:touches withEvent:event];
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
	UITouch *touch = touches.anyObject;
	CGPoint currentTouchPosition = [touch locationInView:self.view];
	
	// If the swipe tracks correctly.
	double diffx = mystartTouchPosition.x - currentTouchPosition.x + 0.1; // adding 0.1 to avoid division by zero
	double diffy = mystartTouchPosition.y - currentTouchPosition.y + 0.1; // adding 0.1 to avoid division by zero
	
	if(abs(diffx / diffy) > 1 && abs(diffx) > HORIZ_SWIPE_DRAG_MIN)
	{
		// It appears to be a swipe.
		if(isProcessingListMove) {
			// ignore move, we're currently processing the swipe
			return;
		}
		
		if (mystartTouchPosition.x < currentTouchPosition.x) {
			isProcessingListMove = YES;
			[self moveToPreviousItem];
			return;
		}
		else {
			isProcessingListMove = YES;
			[self moveToNextItem];
			return;
		}
	}
	else if(abs(diffy / diffx) > 1)
	{
		isProcessingListMove = YES;
		[[self.wv.subviews objectAtIndex:0] touchesMoved:touches	withEvent:event];	
		[super touchesMoved:touches	withEvent:event];
	}

}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{
	isProcessingListMove = NO;
	[super touchesEnded:touches withEvent:event];
	[[self.wv.subviews objectAtIndex:0] touchesEnded:touches withEvent:event];
}

directoryPath = [NSString stringWithFormat:@"%@",NSDocumentDirectory()];
NSString *SaveToDirectoryPath =
            [directoryPath
             stringByAppendingPathComponent: willSaveToDirectory];
            [[NSFileManager defaultManager] createFileAtPath:[NSString stringWithFormat:@"%@/%@",SaveToDirectoryPath,DownloadFileName] contents:recvData attributes:nil];

Core Data是个好东西，在数据储存操作上速度快，容易操作，是一种类似关系数据库的东西。但是有些不那么好学，那到底Core Data是怎么操作的呢？怎么用呢？怎么来编程呢？我们一起来学习吧，接下来使用苹果提供的实例程序Locations来作分析：

>程序介绍：

右侧是改程序的截图，基本上来说就是通过使用Core Location来得到当时的位置，然后在点击“+”的时候记录下当时的经纬度。通过UITableViewController的功能来添加，编辑，删除等功能。整体程序使用Core Data来储存数据，实体（Entity）为一个位置，包括以下参数：1，时间（收集数据的时间）2，纬度，3，经度

首先我们看看该程序的AppDelegate.h

@interface LocationsAppDelegate : NSObject  {
    UIWindow *window;
    UINavigationController *navigationController; //导航栏
 
    //以下定义了Core Data的三个决定性组建，等后面m文件里面再多介绍
    NSPersistentStoreCoordinator *persistentStoreCoordinator;
    NSManagedObjectModel *managedObjectModel;
    NSManagedObjectContext *managedObjectContext;
}
 
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) UINavigationController *navigationController;
 
- (IBAction)saveAction:sender; //这个没找到作用...根本就没用到IB
 
//还记得吧，nonatomic是因为这个程序是单线程
@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator
                              *persistentStoreCoordinator;
@property (nonatomic, readonly) NSString *applicationDocumentsDirectory;
//程序文档目录是主要为了给NSPersistentStoreCoordinator找个存SQLite文件的地方
@end

从上面的我们能看出来，该程序是通过一个根Core Data数据管理来管理整个程序的CoreData数据的，接下来看m文件也会对此作更多的理解。

#import "LocationsAppDelegate.h"
#import "RootViewController.h" //该程序使用了一个根视图控制器，所以导入了这个类
@implementation LocationsAppDelegate
@synthesize window;
@synthesize navigationController;
 
- (void)applicationDidFinishLaunching:(UIApplication *)application {
	//初始化根视图控制器，它是一个列表视图控制器
	RootViewController *rootViewController = [[RootViewController alloc]
             initWithStyle:UITableViewStylePlain];
 
	//通过下面的自定义getter得到CoreData的“被管理对象内容器”
	NSManagedObjectContext *context = [self managedObjectContext];
	if (!context) {
		// 如果getter出错，在这里来排错
	}
	rootViewController.managedObjectContext = context;
	//rootViewController有一个本地“被管理对象内容器”，在这里赋值过去
 
	UINavigationController *aNavigationController = [[UINavigationController alloc]
             initWithRootViewController:rootViewController];
	self.navigationController = aNavigationController;
	//初始化导航栏，根视图为rootViewController，并指定该导航栏为程序导航栏
	[window addSubview:[navigationController view]];
	[window makeKeyAndVisible];
 
	//由于导航栏retain了根视图，所以在这里可以release掉它了
	[rootViewController release];
	//由于self已经retain了导航栏，所以导航栏可以release
	[aNavigationController release];
}
 
//applicationWillTerminate: 在程序结束前，Core Data会保存任何对其的更改
- (void)applicationWillTerminate:(UIApplication *)application {
 
    NSError *error;
    if (managedObjectContext != nil) {
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
			// Handle the error.
        }
    }
}
 
//在得到点击事件后，保存更改
- (IBAction)saveAction:(id)sender {
 
    NSError *error;
    if (![[self managedObjectContext] save:&error]) {
		// Handle error
    }
}
 
//自定义的managedObjectContext的getter, 它其实是真正在使用的时候的被操作对象
- (NSManagedObjectContext *) managedObjectContext {
 
    //如果已经有这个对象，就直接返回，否则继续
    if (managedObjectContext != nil) {
        return managedObjectContext;
    }
 
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (coordinator != nil) {
        managedObjectContext = [[NSManagedObjectContext alloc] init];
        [managedObjectContext setPersistentStoreCoordinator: coordinator];
       //这里可以看到，“内容管理器”和“数据一致性存储器”的关系，
       //managedObjectContext需要得到这个“数据一致性存储器”
    }
    return managedObjectContext;
}
 
//自定义的CoreData数据模板的getter，数据模板其实就是一个描述实体与实体的关系
//，类似于关系型数据库的关系描述文件
- (NSManagedObjectModel *)managedObjectModel {
 
    if (managedObjectModel != nil) {
        return managedObjectModel;
    }
    managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
    //从本地所有xcdatamodel文件得到这个CoreData数据模板
    return managedObjectModel;
}
 
//自定义“数据一致性存储器” persistentStoreCoordinator的getter
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
 
    if (persistentStoreCoordinator != nil) {
        return persistentStoreCoordinator;
    }
 
    //定义一个本地地址到NSURL，用来存储那个SQLite文件
    NSURL *storeUrl = [NSURL fileURLWithPath:
            [[self applicationDocumentsDirectory]
                            stringByAppendingPathComponent: @"Locations.sqlite"]];
 
	NSError *error;
    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc]
            initWithManagedObjectModel: [self managedObjectModel]];
    //从这里可以看出，其实persistentStoreCoordinator需要的不过是一个
    //存储数据的位置，它是负责管理CoreData如何储存数据的
    if (![persistentStoreCoordinator
        addPersistentStoreWithType:NSSQLiteStoreType
        configuration:nil
        URL:storeUrl
        options:nil
        error:&error]) {
        // Handle the error.
    }    
 
    return persistentStoreCoordinator;
}
 
//返回该程序的档案目录，用来简单使用
- (NSString *)applicationDocumentsDirectory {
 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                            NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
    return basePath;
    //我原来的帖子中介绍过，方法其实是一模一样的
}
 
- (void)dealloc {
 
    //释放内存
    [managedObjectContext release];
    [managedObjectModel release];
    [persistentStoreCoordinator release];
 
	[navigationController release];
	[window release];
	[super dealloc];
}
@end

从上面的程序主代理文件可以看出，CoreData的简单使用不过是通过三个组建。

NSManagedObjectModel来描述实体与实体的关系，也就是类似于表和表的关系。
NSManagedObjectContext来得到被储存内容的文件管理器，对数据作直接操作
NSPersistentStoreCoordinator来管理数据的储存位置，储存方法(SQLite)

在我们分析了程序主代理文件（AppDelegate）之后，我们先来看看一对自动生成的文件Event.h/.m

@interface Event : NSManagedObject  {}
@property (nonatomic, retain) NSDate *creationDate;
@property (nonatomic, retain) NSNumber *latitude;
@property (nonatomic, retain) NSNumber *longitude;
@end

#import "Event.h"
@implementation Event
@dynamic creationDate;
@dynamic latitude;
@dynamic longitude;
@end

从上面我们能看出来，一个实体Event也就会被生成一个NSManagedObject（被管理对象），然后任何accessor和getter 都是被动态生成的，我们其实完全不用操任何的心，只需要在xcdatamodel文件里面配置后，点击添加文件，添加NSManagedObject文件，就会看到自动感知的类对象，然后生成就可以了。

下面是根视图控制器，是一个列表视图（UITableViewController）

#import <CoreLocation/CoreLocation.h>
@interface RootViewController : UITableViewController <CLLocationManagerDelegate> {
	//看到是UITableViewController的子类，由于需要使用Core Location，
	//所以在后面履行其protocal
    NSMutableArray *eventsArray;
	NSManagedObjectContext *managedObjectContext;
	//这个被管理对象内容器就是我们真正对Core Data数据的操作对象
    CLLocationManager *locationManager; 	//用来得到地理位置的Core Location对象
    UIBarButtonItem *addButton;	//右上角的添加键
}
@property (nonatomic, retain) NSMutableArray *eventsArray;
@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain) CLLocationManager *locationManager;
@property (nonatomic, retain) UIBarButtonItem *addButton;
- (void)addEvent;
@end

#import "RootViewController.h"
#import "LocationsAppDelegate.h"
#import "Event.h"
@implementation RootViewController
@synthesize eventsArray, managedObjectContext, addButton, locationManager;
 
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"Locations"; //设置列表视图的标题
    self.navigationItem.leftBarButtonItem = self.editButtonItem; //导航栏左边的编辑按钮
 
    addButton = [[UIBarButtonItem alloc]
                initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                target:self
                action:@selector(addEvent)]; //初始化添加按钮，
	addButton.enabled = NO; //在Core Location初始化之前将其关闭
    self.navigationItem.rightBarButtonItem = addButton;
    //把这个添加按钮添加到导航栏右侧
 
	// 启动CLocation
	[[self locationManager] startUpdatingLocation];
 
        //初始化一个“获取请求”到我们的实体“Event”
	NSFetchRequest *request = [[NSFetchRequest alloc] init];
	NSEntityDescription *entity = [NSEntityDescription entityForName:@"Event" 
			inManagedObjectContext:managedObjectContext];
	[request setEntity:entity];
 
	// 将时间以建立时间排序，最新的在最上
	NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"creationDate" ascending:NO];
	NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
	[request setSortDescriptors:sortDescriptors];
	[sortDescriptor release];
	[sortDescriptors release];
 
	// 执行“获取”操作，得到一个“可变数组”的拷贝
	NSError *error = nil;
	NSMutableArray *mutableFetchResults = [[managedObjectContext 
				executeFetchRequest:request 
				error:&error] mutableCopy];
	if (mutableFetchResults == nil) {
		//如果结果为空，在这作错误响应
	}
 
	// 将得到的本地数组赋值到本类的全局数组，然后清理无用的对象
	[self setEventsArray:mutableFetchResults];
	[mutableFetchResults release];
	[request release];
}
 
- (void)viewDidUnload {
	// 当视图被卸载后，将以下指针置空
	self.eventsArray = nil;
	self.locationManager = nil;
	self.addButton = nil;
}
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
	// 只有一个章节
    return 1;
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
	// 在数组里面有多少个对象，在列表视图就有多少行
    return [eventsArray count];
}
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
 
	// 一个“日期格式化器”（凑合明白就好...）用来以特定的格式创建得到的日期
    static NSDateFormatter *dateFormatter = nil;
	if (dateFormatter == nil) {
		dateFormatter = [[NSDateFormatter alloc] init];
		[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
		[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
	}
 
	static NSNumberFormatter *numberFormatter = nil;
	if (numberFormatter == nil) {
		numberFormatter = [[NSNumberFormatter alloc] init];
		[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
		[numberFormatter setMaximumFractionDigits:3];
	}
 
    static NSString *CellIdentifier = @"Cell";
 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
			reuseIdentifier:CellIdentifier] autorelease];
		UITableViewCellStyleSubtitle;
    }
 
	// 从数组中得到这个Event对象
	Event *event = (Event *)[eventsArray objectAtIndex:indexPath.row];
 
	cell.textLabel.text = [dateFormatter stringFromDate:[event creationDate]];
 
	NSString *string = [NSString stringWithFormat:@"%@, %@",
						[numberFormatter stringFromNumber:[event latitude]],
						[numberFormatter stringFromNumber:[event longitude]]];
    cell.detailTextLabel.text = string;
 
	return cell;
}
 
- (void)tableView:(UITableView *)tableView 
	commitEditingStyle:(UITableViewCellEditingStyle)editingStyle 
	forRowAtIndexPath:(NSIndexPath *)indexPath 
{
 
    if (editingStyle == UITableViewCellEditingStyleDelete) {
 
        // 删除被惯例对象在索引路径（index path）
		NSManagedObject *eventToDelete = [eventsArray objectAtIndex:indexPath.row];
		[managedObjectContext deleteObject:eventToDelete];
 
	// 更新数组和列表视图
        [eventsArray removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
 
		// 提交更改到Core Data
		NSError *error;
		if (![managedObjectContext save:&error]) {
			// Handle the error.
		}
    }
}
 
- (void)addEvent {
	//如果得不到位置，就返回.
	CLLocation *location = [locationManager location];
	if (!location) {
		return; }
 
	 //建立一个Event实体对象
	Event *event = (Event *)[NSEntityDescription 
			insertNewObjectForEntityForName:@"Event" 
			inManagedObjectContext:managedObjectContext];
 
	//得到经纬度，然后赋值到event对象去
	CLLocationCoordinate2D coordinate = [location coordinate];
	[event setLatitude:[NSNumber numberWithDouble:coordinate.latitude]];
	[event setLongitude:[NSNumber numberWithDouble:coordinate.longitude]];
 
	// 实例里面并没有使用CL的时间标签，因为在模拟器中会是一样的
	// [event setCreationDate:[location timestamp]];
	[event setCreationDate:[NSDate date]]; 
	//所以现在使用的是现在的时间，而不是得到位置的时候的时间
 
	// 保存更改
	NSError *error;
	if (![managedObjectContext save:&error]) {
		// Handle the error.
	}
 
	// 将新Event放到最上面，所以添加到0的位置
	// 然后滚动列表视图到最上面，如果没有那么多的数据是看不出来区别的
	[eventsArray insertObject:event atIndex:0];
	NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
	[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] 
			withRowAnimation:UITableViewRowAnimationFade];
	[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] 
			atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
 
- (CLLocationManager *)locationManager {
	//自定义的CLocation的getter，方便初始化
    if (locationManager != nil) {
		return locationManager;
	}
	//初始化CL对象，然后设置精准度，然后将代理对象设为本地
	locationManager = [[CLLocationManager alloc] init];
	[locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];
	[locationManager setDelegate:self];
 
	return locationManager;
}
//CLocation的一个代理方法，如果成功就开启右侧添加按钮
- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation {
    addButton.enabled = YES;
}
//CLocation的一个代理方法，如果失败了就关闭（disable）右侧添加按钮
- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error {
    addButton.enabled = NO;
}
 
- (void)dealloc {
	//释放对象
	[managedObjectContext release];
	[eventsArray release];
    [locationManager release];
    [addButton release];
    [super dealloc];
}
@end

从上面的源代码，我们可以看出，
1，在这里数据并不是每次都由NSManagedContext对象得到，而是由一个数组得出。
2，数组是一个可变数组，由第一次载入的视图的时候从NSManagedContext中得到
3，从NSManagedContext对象中得到数据需要使用NSFetchRequest来初始化一个“获取”
4，每次获得新的数据的时候，同时保存到数组和NSManagedContext中，添加后需要对更改进行提交

我在写电子书 Tread 的时候 , 想实现自动隐藏 UINavigationBar, 以达到 iPhone 上面浏览 Photo 的效果 . 当时 NavigationBar 在 UINavigationController 里面是 private 的 , 无法把她变成透明 . 最后只好把它
　　

在写电子书Tread的时候,想实现自动隐藏UINavigationBar,以达到iPhone上面浏览Photo的效果.

当时NavigationBar在UINavigationController里面是private的,无法把她变成透明.

 

最后只好把它"推出"view 外面,来达到隐藏的目的.

在Beta1一直到Beta4,是这样写的


[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:0.5];

 

CGRect viewFrame =  self.navigationController.view.bounds;

//CGPoint touchPoint1 = self.navigationController.view.center;

if (viewIsUp) {

viewFrame.origin.y -= 25;

viewFrame.size.height -= 50;

viewIsUp = NO;

} else {

viewFrame.origin.y += 25;

viewFrame.size.height += 50;

viewIsUp = YES;

}

self.navigationController.view.bounds =viewFrame;

[UIView commitAnimations];


刚发布的Beta5,这个功能已经加在API里面了

现在变成

if (viewIsUp) {

[self.navigationController setNavigationBarHidden:NO animated:YES];

viewIsUp = NO;

} else {

[self.navigationController setNavigationBarHidden:YES animated:YES];

viewIsUp = YES;

}

#define SCROLLVIEW_CONTENT_HEIGHT_PORTRAIT	800
#define SCROLLVIEW_CONTENT_WIDTH_PORTRAIT	320
#define SCROLLVIEW_CONTENT_HEIGHT_LANDSCAPE     670
#define SCROLLVIEW_CONTENT_WIDTH_LANDSCAPE	480

........
- (void)viewWillAppear:(BOOL)animated 
{
	[super viewWillAppear:animated];
	
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) 
										name: UIKeyboardDidShowNotification object:nil];
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) 
										name: UIKeyboardDidHideNotification object:nil];
	
	m_scrollView.contentSize = CGSizeMake(SCROLLVIEW_CONTENT_WIDTH_PORTRAIT, SCROLLVIEW_CONTENT_HEIGHT_PORTRAIT);	
	displayKeyboard = NO;
}

- (void)viewWillDisappear:(BOOL)animated 
{
	[[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
	// Return YES for supported orientations 
	return (interfaceOrientation !=	UIInterfaceOrientationPortraitUpsideDown);
}

- (void)keyboardDidShow: (NSNotification *)notif 
{
	if (displayKeyboard) {
		return;
	}	
	
	if (self.interfaceOrientation == UIInterfaceOrientationLandscapeLeft || 
		self.interfaceOrientation == UIInterfaceOrientationLandscapeRight) 
	{
		m_scrollView.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH_LANDSCAPE, 140);
	}
	else 
	{
		m_scrollView.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH_PORTRAIT, 240);
	}
	
	CGRect textFieldRect = [m_activeField frame];
	textFieldRect.origin.y += 10;
	[m_scrollView scrollRectToVisible:textFieldRect animated:YES];

	displayKeyboard = YES;
}

- (void) keyboardDidHide: (NSNotification *)notif 
{
	if (!displayKeyboard) {
		return; 
	}
	
	if (self.interfaceOrientation == UIInterfaceOrientationLandscapeLeft || 
		self.interfaceOrientation == UIInterfaceOrientationLandscapeRight) 
	{
		m_scrollView.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH_LANDSCAPE, 300);
		m_scrollView.contentSize = CGSizeMake(SCROLLVIEW_CONTENT_WIDTH_LANDSCAPE, SCROLLVIEW_CONTENT_HEIGHT_LANDSCAPE);
	}
	else
	{
		m_scrollView.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH_PORTRAIT, 460);
		m_scrollView.contentSize = CGSizeMake(SCROLLVIEW_CONTENT_WIDTH_PORTRAIT, SCROLLVIEW_CONTENT_HEIGHT_PORTRAIT);
	}
	
	displayKeyboard = NO;	
}

//declare the protocol 
@protocol ModalViewControllerDelegate<NSObject>
- (void) didFinishModalView: (ModalViewController*) aModalViewController;
@end

//declare a delegate property
@interface ModalViewController : UIViewController {
}

@property (nonatomic, assign) id<ModalViewControllerDelegate> delegate;

@end

//
[delegate didFinishModalView: self];

////////////////////

//make the view controller confort to the protocol
<ModalViewControllerDelegate>

//initiate modal view and present it
	ModalViewController *myModalViewController = [[MyViewController alloc] initWithNibName: @"ModalViewController" bundle: [NSBundle mainBundle]];
	
	myModalViewController.delegate = self;
	[self presentModalViewController: myModalViewController animated: YES];

//dismiss the modal view
- (void) didFinishModalView: (ModalViewControllerDelegate*) aModalViewControllerDelegate {
    [self dismissModalViewControllerAnimated: YES];
}

NSArray *array = [NSArray arrayWithObjects:
        @"One", @"Two", @"Three", @"Four", nil];
for (NSString *element in array) {
    NSLog(@"element: %@", element);
}

[tableView setEditing:YES];

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
	int chapter = [[[book bookmarks] objectAtIndex: indexPath.row] intValue];
	[book removeBookmark: chapter];
	[tableView deleteRowsAtIndexPaths: [NSArray arrayWithObject: indexPath] withRowAnimation: UITableViewRowAnimationFade];
}