masterviewcontroller.m

sqlite book source code for references

/*
     File: MasterViewController.m
 Abstract: 
Controls the table and navigation between master and detail views.  

  Version: 1.9
 
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 */

#import "MasterViewController.h"
// Need to import the AppDelegate because it owns the books array and we want access to that property.
#import "AppDelegate.h"
#import "DetailViewController.h"
#import "EditingViewController.h"
#import "AddViewController.h"
#import "Book.h"

// Manage the editing view controller from this class so it can be easily accessed from both the detail and add controllers.
static EditingViewController *__editingViewController = nil;

// Private interface for MasterViewController - internal only methods.
@interface MasterViewController ()

@property (nonatomic, retain) UITableView *tableView;
@property (nonatomic, retain) UINavigationController *addNavigationController;
@property (nonatomic, retain) DetailViewController *detailViewController;
@property (nonatomic, retain) AddViewController *addViewController;

@end

@implementation MasterViewController

@synthesize tableView, addNavigationController, detailViewController, addViewController;

+ (EditingViewController *)editingViewController {
    // Instantiate the editing view controller if necessary.
    if (__editingViewController == nil) {
        __editingViewController = [[EditingViewController alloc] initWithNibName:@"EditingView" bundle:nil];
    }
    return __editingViewController;
}

- (void)dealloc {
    // Release allocated resources.
    [tableView release];
    [addNavigationController release];
    [super dealloc];
}

// Set up the user interface.
- (void)viewDidLoad {
    self.navigationItem.leftBarButtonItem = self.editButtonItem;
}

// Update the table before the view displays.
- (void)viewWillAppear:(BOOL)animated {
    [self.tableView reloadData];
}

// Invoked when the user touches Edit.
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    // Updates the appearance of the Edit|Done button as necessary.
    [super setEditing:editing animated:animated];
    [self.tableView setEditing:editing animated:YES];
    // Disable the add button while editing.
    if (editing) {
        self.navigationItem.rightBarButtonItem.enabled = NO;
    } else {
        self.navigationItem.rightBarButtonItem.enabled = YES;
    }
}

- (IBAction)addBook:(id)sender {
    AddViewController *controller = self.addViewController;
    controller.book = [[[Book alloc] init] autorelease];
    if (addNavigationController == nil) {
        UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller];
        self.addNavigationController = navController;
        [navController release];
    }
    [self.navigationController presentModalViewController:addNavigationController animated:YES];
    [controller setEditing:YES animated:NO];
}

- (DetailViewController *)detailViewController {
    // Instantiate the detail view controller if necessary.
    if (detailViewController == nil) {
        detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
    }
    return detailViewController;
}

- (AddViewController *)addViewController {
    // Instantiate the add view controller if necessary.
    if (addViewController == nil) {
        addViewController = [[AddViewController alloc] initWithNibName:@"DetailView" bundle:nil];
    }
    return addViewController;
}

#pragma mark Table Delegate and Data Source Methods
// These methods are all part of either the UITableViewDelegate or UITableViewDataSource protocols.

// This table will always only have one section.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tv {
    return 1;
}

// One row per book, the number of books is the number of rows.
- (NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    return appDelegate.books.count;
}

// The accessory type is the image displayed on the far right of each table cell. In order for the delegate method
// tableView:accessoryButtonClickedForRowWithIndexPath: to be called, you must return the "Detail Disclosure Button" type.
- (UITableViewCellAccessoryType)tableView:(UITableView *)tv accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {
    return UITableViewCellAccessoryDisclosureIndicator;
}

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:@"MyIdentifier"];
    if (cell == nil) {
        // Create a new cell. CGRectZero allows the cell to determine the appropriate size.
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"MyIdentifier"] autorelease];
    }
    // Retrieve the book object matching the row from the application delegate's array.
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    Book *book = (Book *)[appDelegate.books objectAtIndex:indexPath.row];
    cell.text = book.title;
    return cell;
}

- (NSIndexPath *)tableView:(UITableView *)tv willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Inspect the book (method defined above).
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    Book *book = [appDelegate.books objectAtIndex:indexPath.row];
    DetailViewController *controller = self.detailViewController;
    // Retrieve the other attributes of the book from the database (if needed).
    [book hydrate];
    // Set the detail controller's inspected item to the currently-selected book.
    controller.book = book;
    // "Push" the detail view on to the navigation controller's stack.
    [self.navigationController pushViewController:controller animated:YES];
    [controller setEditing:NO animated:NO];
    return nil;
}

- (void)tableView:(UITableView *)tv commitEditingStyle:(UITableViewCellEditingStyle)editingStyle 
                forRowAtIndexPath:(NSIndexPath *)indexPath {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    // If row is deleted, remove it from the list.
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Find the book at the deleted row, and remove from application delegate's array.
        Book *book = [appDelegate.books objectAtIndex:indexPath.row];
        [appDelegate removeBook:book];
        // Animate the deletion from the table.
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] 
                withRowAnimation:UITableViewRowAnimationFade];
    }
}

@end