iOS Day 12

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

AppDelegateCoreData.m

#pragma mark - Core Data 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:@"DayTwelveData" 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:@"DayTwelveData.sqlite"];
    
    NSError *error = nil;
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
        
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
    
    return _persistentStoreCoordinator;
}

AppDelegateMethods.m

- (void)saveContext
{
    NSError *error = nil;
    NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
    if (managedObjectContext != nil) {
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
            // Replace this implementation with code to handle the error appropriately.
            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
    }
}

#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];
}

AppDelegateVars.m

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

tappedLoadData.m

- (IBAction)tappedLoadData:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    NSManagedObjectContext *context = [delegate managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription
                                   entityForName:@"DataRecord" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSError *error;
    fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    for (NSManagedObject *obj in fetchedObjects) {
        NSLog(@"Name: %@", [obj valueForKey:@"name"]);
        NSLog(@"Info: %@", [obj valueForKey:@"info"]);
        NSLog(@"Number: %@", [obj valueForKey:@"number"]);
        NSLog(@"Create Date: %@", [obj valueForKey:@"createDate"]);
        NSLog(@"Last Update: %@", [obj valueForKey:@"updateDate"]);
    }
    
    NSManagedObject *obj = [fetchedObjects objectAtIndex:0];
    [self displayManagedObject:obj];
    selectedObject = obj;
}

ViewControllerContext.h

@interface ViewController : UIViewController

@property (nonatomic,strong) NSManagedObjectContext* managedObjectContext;

@property (weak, nonatomic) IBOutlet UITextField *txtName;
@property (weak, nonatomic) IBOutlet UITextField *txtInfo;
@property (weak, nonatomic) IBOutlet UITextField *txtNumber;
@property (weak, nonatomic) IBOutlet UILabel *lblCreateDate;
@property (weak, nonatomic) IBOutlet UILabel *lblUpdateDate;
- (IBAction)tappedSaveAsNew:(id)sender;
- (IBAction)tappedLoadData:(id)sender;
- (IBAction)tappedNext:(id)sender;
- (IBAction)tappedPrevious:(id)sender;

@end

ViewControllerSave.m

- (IBAction)tappedSaveAsNew:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    NSManagedObjectContext *context = [delegate managedObjectContext];
    NSManagedObject *dataRecord = [NSEntityDescription
           insertNewObjectForEntityForName:@"DataRecord"
           inManagedObjectContext:context];
    [dataRecord setValue:self.txtName.text forKey:@"name"];
    [dataRecord setValue:self.txtInfo.text forKey:@"info"];
    [dataRecord setValue:[NSNumber numberWithInteger:[self.txtNumber.text integerValue]] forKey:@"number"];
    [dataRecord setValue:[NSDate date] forKey:@"createDate"];
    [dataRecord setValue:[NSDate date] forKey:@"updateDate"];
    NSError *error;
    if (![context save:&error]) {
        NSLog(@"Error:%@", error);
    }
    NSLog(@"Data saved");
}

ViewControllerText.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.txtInfo.delegate = self;
    self.txtName.delegate = self;
    self.txtNumber.delegate = self;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return YES;
}

ViewControllerTextD.h

@interface ViewController : UIViewController <UITextFieldDelegate>

ViewControllerUI.h

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITextField *txtName;
@property (weak, nonatomic) IBOutlet UITextField *txtInfo;
@property (weak, nonatomic) IBOutlet UITextField *txtNumber;
@property (weak, nonatomic) IBOutlet UILabel *lblCreateDate;
@property (weak, nonatomic) IBOutlet UILabel *lblUpdateDate;
- (IBAction)tappedSaveAsNew:(id)sender;
- (IBAction)tappedLoadData:(id)sender;
- (IBAction)tappedNext:(id)sender;
- (IBAction)tappedPrevious:(id)sender;

@end