objective-c : Note with Core Data (SwiftNote5)

Note with Core Data (SwiftNote5).m

//Note with Core Data (SwiftNote5)


//1. save, delete, edit note with coredata (AddNoteView, TableView)

//AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;

- (void)saveContext;
- (NSURL *)applicationDocumentsDirectory;

@end





//AppDelegate.m

#import "NoteListTableViewController.h"

@implementation AppDelegate

@synthesize managedObjectContext = _managedObjectContext;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;



#pragma mark - DidFinishLaunchingWithOptions

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
    NoteListTableViewController *controller = (NoteListTableViewController *)navigationController.topViewController;
    controller.managedObjectContext = self.managedObjectContext;
    return YES;
}



#pragma mark - SaveContext

- (void)saveContext
{
    NSError *error = nil;
    NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
    if (managedObjectContext != nil) {
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
            
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        } 
    }
}



#pragma mark - CoreData stack

// Returns the managed object context for the application.
// If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
- (NSManagedObjectContext *)managedObjectContext
{
    if (_managedObjectContext != nil) {
        return _managedObjectContext;
    }
    
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (coordinator != nil) {
        _managedObjectContext = [[NSManagedObjectContext alloc] init];
        [_managedObjectContext setPersistentStoreCoordinator:coordinator];
    }
    return _managedObjectContext;
}


// Returns the managed object model for the application.
// If the model doesn't already exist, it is created from the application's model.
- (NSManagedObjectModel *)managedObjectModel
{
    if (_managedObjectModel != nil) {
        return _managedObjectModel;
    }
    NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"SwiftNote5" withExtension:@"momd"];
    _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
    return _managedObjectModel;
}


// Returns the persistent store coordinator for the application.
// If the coordinator doesn't already exist, it is created and the application's store added to it.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    if (_persistentStoreCoordinator != nil) {
        return _persistentStoreCoordinator;
    }
    
    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"SwiftNote5.sqlite"];
    
    NSError *error = nil;
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
        /*
         Replace this implementation with code to handle the error appropriately.
        */
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    
    
    return _persistentStoreCoordinator;
}



#pragma mark - Application's Documents directory

// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}




#pragma mark - application 상태

- (void)applicationWillTerminate:(UIApplication *)application
{
    [self saveContext];
}



@end




//CoreViewController.h

#import <QuartzCore/QuartzCore.h> // 테두리가 둥근 UITextView 만들기

@interface CoreViewController : UIViewController

#pragma mark - 테두리가 둥근 UITextView 만들기

- (void)roundCorneredTextView:(UITextView *)textView;

@end




//CoreViewController.m

@implementation CoreViewController

#pragma mark - 테두리가 둥근 UITextView 만들기 : QuartzCore 프레임워크

- (void)roundCorneredTextView:(UITextView *)textView
{
    // 테두리가 둥근 UITextView 만들기
    textView.layer.cornerRadius = 10;
    textView.clipsToBounds = YES;
}


@end




//AddNoteViewController.h

#import "CoreViewController.h"
#import "Note.h"

@protocol AddNoteViewControllerDelegate;


@interface AddNoteViewController : CoreViewController <UITextViewDelegate, UITextFieldDelegate>

@property (strong, nonatomic) IBOutlet UITextField *noteTitleTextField;
@property (strong, nonatomic) IBOutlet UITextView *noteTextView;

//AddNoteViewControllerDelegate
@property (nonatomic, weak) id <AddNoteViewControllerDelegate> delegate;
@property (nonatomic, strong) Note *currentNote;

@end


#pragma mark - AddNoteViewControllerDelegate : AddView의 상태변경을 테이블 뷰에 알려주고 저장/취소/뷰 해제 등을 하기 위한 델리게이트 메소드

@protocol AddNoteViewControllerDelegate

-(void)addNoteViewControllerDidSave;
-(void)addNoteViewControllerDidCancel:(Note *)noteToDelete;

@end




//AddNoteViewController.m

#import "AddNoteViewController.h"

@interface AddNoteViewController () <UITextViewDelegate, UITextFieldDelegate>

@property (strong, nonatomic) IBOutlet UIBarButtonItem *saveButton;

@end


@implementation AddNoteViewController

@synthesize noteTitleTextField;
@synthesize noteTextView;


#pragma mark - View Life Cycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [super roundCorneredTextView:self.noteTextView]; // CoreViewController의 roundCorneredTextView 메소드로 테두리가 둥근 UITextView 만들기
}



#pragma mark - Memory Warning

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}



#pragma mark - Button Action Method: save나 cancel 버튼 click시 delegate method call

- (IBAction)cancelButtonPressed:(UIBarButtonItem *)sender {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    //remove the object
    [self.delegate addNoteViewControllerDidCancel:[self currentNote]];
}



- (IBAction)saveButtonPressed:(UIBarButtonItem *)sender {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    //save the context
    [self.currentNote setNoteTitle:noteTitleTextField.text];
    [self.currentNote setNoteBody:noteTextView.text];
    [self.delegate addNoteViewControllerDidSave];
}


@end




//NoteListTableViewController.h

#import "AddNoteViewController.h"

@interface NoteListTableViewController : UITableViewController <AddNoteViewControllerDelegate, NSFetchedResultsControllerDelegate>

@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController; //manage the results returned from a Core Data fetch request to provide data for a UITableView object

@end





//  NoteListTableViewController.m

#import "Note.h"

@implementation NoteListTableViewController

@synthesize fetchedResultsController = _fetchedResultsController;



#pragma mark - AddNoteViewController Delegate

-(void)addNoteViewControllerDidCancel:(Note *)noteToDelete {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    NSManagedObjectContext *context = self.managedObjectContext;
    [context deleteObject:noteToDelete];
    NSLog(@"Delete note object!");
    
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog (@"Dismiss AddNoteView Complete!");
    }];
}


-(void) addNoteViewControllerDidSave {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    NSError *error = nil;
    NSManagedObjectContext *context = self.managedObjectContext;
    if (![context save:&error]) {
        NSLog(@"Error! %@", error);
    }
    NSLog(@"Save note object!");
    
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Dismiss AddNoteView Complete!");
    }];
}



#pragma mark - PrepareForSegue

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    
    if ([[segue identifier] isEqualToString:@"AddNote"]) {
        
        UINavigationController *nav = [segue destinationViewController];
        AddNoteViewController *anvc = (AddNoteViewController *)[nav topViewController];
        anvc.delegate =self;
        
        Note *newNote = (Note *) [NSEntityDescription
                                  insertNewObjectForEntityForName:@"Note"
                                  inManagedObjectContext:[self managedObjectContext]];
        
        anvc.currentNote = newNote;
    }
}


#pragma mark - View Life Cycle

- (void)viewDidLoad
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    [super viewDidLoad];
    
    //performFetch
    NSError *error = nil;
    if (![[self fetchedResultsController] performFetch:&error]) {
        NSLog(@"Error! %@",error);
        abort();
    }
    
    NSLog (@"performFetch!");
}



#pragma mark - TableView DataSource


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[self.fetchedResultsController sections]count];
}



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    id <NSFetchedResultsSectionInfo> secInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
    return [secInfo numberOfObjects];
}



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
//    much simpler way
//    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }
    
    // Configure the cell...
    Note *note = [self.fetchedResultsController objectAtIndexPath:indexPath];
    cell.textLabel.text = note.noteTitle;
    
    return cell;
}



#pragma mark - TableView 헤더

-(NSString *) tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    
    return [[[self.fetchedResultsController sections]objectAtIndex:section]name];
}



#pragma mark - TableView 행 높이

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 50;
}



#pragma mark - TableView 편집

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        
        NSManagedObjectContext *context = [self managedObjectContext];
        Note *noteToDelete = [self.fetchedResultsController objectAtIndexPath:indexPath];
        [context deleteObject:noteToDelete];
        
        // Save 컨텍스트
        NSError *error = nil;
        if (![context save:&error]) {
            
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        }
    }   
}



#pragma mark - NSFetchedResultsController

- (NSFetchedResultsController *)fetchedResultsController
{
    if (_fetchedResultsController != nil) {
        return _fetchedResultsController;
    }
    
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    
    // Edit the entity name as appropriate.
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Note" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];
    
    // Set the batch size to a suitable number.
    [fetchRequest setFetchBatchSize:20];
    
    // Edit the sort key as appropriate.
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"noteTitle" ascending:YES];
    NSArray *sortDescriptors = @[sortDescriptor];
    [fetchRequest setSortDescriptors:sortDescriptors];
    
    // Edit the section name key path and cache name if appropriate.
    // nil for section name key path means "no sections".
    _fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"noteTitle" cacheName:nil];
    _fetchedResultsController.delegate = self;
    
    return _fetchedResultsController;
}



#pragma mark - NSFetchedResultsController Delegate Method

// 섹션 수정사항 반영
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}


// 컨텐츠 수정사항 반영
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    UITableView *tableView = self.tableView;
    
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeUpdate: {
            Note *changedNote = [self.fetchedResultsController objectAtIndexPath:indexPath];
            UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
            cell.textLabel.text = changedNote.noteTitle;
        }
            break;
            
        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}



- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView endUpdates];
    //    [self.tableView reloadData];
}



#pragma mark - Memory Warning

- (void)didReceiveMemoryWarning
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    [super didReceiveMemoryWarning];
}



@end




//2. save, delete, edit note with coredata (DisplayEditView, TableView)


//NoteListTableViewController.m

#import "DisplayEditViewController.h"

@implementation NoteListTableViewController

#pragma mark - PrepareForSegue

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    
    //...
    
    if ([[segue identifier] isEqualToString:@"EditNote"]) {
        
        DisplayEditViewController *devc = (DisplayEditViewController *)[segue destinationViewController];
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        Note *selectedNote = (Note *)[self.fetchedResultsController objectAtIndexPath:indexPath];
        devc.currentNote = selectedNote;
    }
}




//DisplayEditViewController.h

#import "CoreViewController.h"
#import "Note.h"


@interface DisplayEditViewController : CoreViewController

@property (nonatomic, strong) Note *currentNote;

@end



//DisplayEditViewController.m

#import "AppDelegate.h"  //saveContext 메소드 호출


@interface DisplayEditViewController ()

@property (strong, nonatomic) IBOutlet UITextField *noteTitleTextField;
@property (strong, nonatomic) IBOutlet UITextView *noteTextView;

@end



@implementation DisplayEditViewController


#pragma mark - View Life Cycle

- (void)viewDidLoad
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    [super viewDidLoad];
    
    self.noteTitleTextField.text = [self.currentNote noteTitle];
    self.noteTextView.text = [self.currentNote noteBody];
    
    // CoreViewController의 roundCorneredTextView 메소드로 테두리가 둥근 UITextView 만들기
    [super roundCorneredTextView:self.noteTextView];
}



#pragma mark - Bar Button Action Method: 컨텍스트 저장, 뷰 pop

- (IBAction)saveButtonPressed:(UIBarButtonItem *)sender
{
    _currentNote.noteTitle = self.noteTitleTextField.text;
    _currentNote.noteBody = self.noteTextView.text;
    
    AppDelegate *myAppDelegate = (AppDelegate *) [[UIApplication sharedApplication]delegate];
    [myAppDelegate saveContext];
    
    [self.navigationController popViewControllerAnimated:YES];
}



#pragma mark - Memory Warning

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end