detailviewcontroller.m

sqlite book source code for references

/*
     File: DetailViewController.m
 Abstract: 
Displays the details of a Book object and allows the user the edit them.

  Version: 1.9
 
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 */

#import "DetailViewController.h"
#import "Book.h"
#import "MasterViewController.h"
#import "EditingViewController.h"
#import "AppDelegate.h"

@interface DetailViewController ()

@property (nonatomic, retain) NSDateFormatter *dateFormatter;
@property (nonatomic, retain) UITableView *tableView;
@property (nonatomic, retain) NSIndexPath *selectedIndexPath;

@end


@implementation DetailViewController

@synthesize book, dateFormatter, tableView, selectedIndexPath;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Title displayed by the navigation controller.
        self.title = @"Info";
        // Create a date formatter to convert the date to a string format.
        dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
        [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
    }
    return self;
}

- (void)dealloc {
    // Release owned resources.
    [selectedIndexPath release];
    [tableView release];
    [book release];
    [dateFormatter release];
    [super dealloc];
}

- (void)viewDidLoad {
    self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewWillAppear:(BOOL)animated {
    // Remove any existing selection.
    [tableView deselectRowAtIndexPath:selectedIndexPath animated:NO];
    // Redisplay the data.
    [tableView reloadData];
}

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    [self.navigationItem setHidesBackButton:editing animated:animated];
    [tableView reloadData];
}

#pragma mark -
#pragma mark <UITableViewDelegate, UITableViewDataSource> Methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tv {
    // 3 sections, one for each property
    return 3;
}

- (NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section {
    // Only one row for each section
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [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];
    }
    switch (indexPath.section) {
        case 0: cell.text = book.title; break;
        case 1: cell.text = [dateFormatter stringFromDate:book.copyright]; break;
        case 2: cell.text = book.author; break;
    }
    return cell;
}

- (NSString *)tableView:(UITableView *)tv titleForHeaderInSection:(NSInteger)section {
    // Return the displayed title for the specified section.
    switch (section) {
        case 0: return @"Title";
        case 1: return @"Copyright";
        case 2: return @"Author";
    }
    return nil;
}

- (NSIndexPath *)tableView:(UITableView *)tv willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Only allow selection if editing.
    return (self.editing) ? indexPath : nil;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    EditingViewController *controller = [MasterViewController editingViewController];
    
    controller.editedObject = book;
    switch (indexPath.section) {
        case 0: {
            controller.textValue = book.title;
            controller.editedFieldKey = @"title";
            controller.dateEditing = NO;
        } break;
        case 1: {
            controller.dateValue = book.copyright;
            controller.editedFieldKey = @"copyright";
            controller.dateEditing = YES;
        } break;
        case 2: {
            controller.textValue = book.author;
            controller.editedFieldKey = @"author";
            controller.dateEditing = NO;
        } break;
    }
    self.selectedIndexPath = indexPath;
    [self.navigationController pushViewController:controller animated:YES];
}

- (UITableViewCellAccessoryType)tableView:(UITableView *)tv accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {
    // Show the disclosure indicator if editing.
    return (self.editing) ? UITableViewCellAccessoryDisclosureIndicator : UITableViewCellAccessoryNone;
}

@end