#import "AppDelegate.h"#import "Person.h"@implementation AppDelegate@synthesize managedObjectContext = _managedObjectContext;@synthesize managedObjectModel = _managedObjectModel;@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    [self createNewPersonWithFirstName:@"Anthony" lastName:@"Robbins" age:51];    [self createNewPersonWithFirstName:@"Richard" lastName:@"Branson" age:61];        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc]initWithEntityName:@"Person"];        NSSortDescriptor *ageSort = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];        NSSortDescriptor *firstNameSort = [[NSSortDescriptor alloc] initWithKey:@"firstName" ascending:YES];        fetchRequest.sortDescriptors = @[ageSort, firstNameSort];        NSError *requstError = nil;        NSArray *persons = [self.managedObjectContext executeFetchRequest:fetchRequest error:&requstError];        for (Person *person in persons) {        NSLog(@"First Name = %@", person.firstName);        NSLog(@"Last Name= %@", person.lastName);        NSLog(@"Age = %lu", (unsigned long)[person.age unsignedCharValue]);    }        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    // Override point for customization after application launch.    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}-(BOOL) deletePerson:(NSArray*)praramPersons{    BOOL isDelete = NO;        if ([praramPersons count] > 0) {        Person *lastPerson = [praramPersons lastObject];        [self.managedObjectContext deleteObject:lastPerson];                NSError *savingError = nil;        if ([self.managedObjectContext save:&savingError]) {            NSLog(@"Successfully deleted the last Person in the array");        } else {            NSLog(@"Failed to delete the last Person in the array");        }    } else {        NSLog(@"Could not find any Person entities in the context");    }            return isDelete;}-(BOOL) createPersonSuccess:(NSArray*)paramPersons{    BOOL createResult = NO;        if ([paramPersons count] > 0) {        createResult = YES;        NSUInteger counter = 1;        for (Person *thisPerson in paramPersons) {            NSLog(@"Person %lu First Name = %@", (unsigned long)counter, thisPerson.firstName);            NSLog(@"Person %lu lastName = %@", (unsigned long)counter, thisPerson.lastName);            NSLog(@"Person %lu Age = %ld", (unsigned long)counter, (unsigned long)[thisPerson.age unsignedIntegerValue]);            counter ++;        }    } else {        NSLog(@"Could not find any Person entities in the context");    }        return createResult;}-(void)createNewPerson{    Person *newPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:self.managedObjectContext];        if (newPerson != nil) {        newPerson.firstName = @"Anthony";        newPerson.lastName = @"Robbins";        newPerson.age = @51;                NSError *savingError = nil;                if ([self.managedObjectContext save:&savingError]) {            NSLog(@"Successfully saved the context.");        } else {            NSLog(@"Failed to save the context. Error = %@", savingError);        }    } else {        NSLog(@"Failed to create the new Person.");    }    }-(BOOL) createNewPersonWithFirstName:(NSString*)paramFirstName                            lastName:(NSString*)paramLastName                                 age:(NSUInteger)paramAge{    BOOL result = NO;        if ([paramFirstName length] == 0 | [paramLastName length] == 0) {        NSLog(@"First and Last names are mandatory");        return NO;    }        Person *newPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:self.managedObjectContext];        if (newPerson == nil) {        NSLog(@"Failed to create the new person.");        return NO;    }        newPerson.firstName = paramFirstName;    newPerson.lastName = paramLastName;    newPerson.age = @(paramAge);        NSError *savingError = nil;        if ([self.managedObjectContext save:&savingError]) {        return YES;    } else {        NSLog(@"Failed to save the new person.Error = %@", savingError);    }    return result;}

2014-09-13 00:20:18.452 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.453 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.454 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.454 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.454 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.455 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.455 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.455 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.456 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.456 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.456 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.457 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.457 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.457 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.458 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.458 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.458 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.459 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.459 CoreDataDemo[683:60b] First Name = Anthony2014-09-13 00:20:18.485 CoreDataDemo[683:60b] Last Name= Robbins2014-09-13 00:20:18.486 CoreDataDemo[683:60b] Age = 512014-09-13 00:20:18.487 CoreDataDemo[683:60b] First Name = Richard2014-09-13 00:20:18.487 CoreDataDemo[683:60b] Last Name= Branson2014-09-13 00:20:18.487 CoreDataDemo[683:60b] Age = 612014-09-13 00:20:18.488 CoreDataDemo[683:60b] First Name = Richard2014-09-13 00:20:18.488 CoreDataDemo[683:60b] Last Name= Branson2014-09-13 00:20:18.489 CoreDataDemo[683:60b] Age = 612014-09-13 00:20:18.489 CoreDataDemo[683:60b] First Name = Richard2014-09-13 00:20:18.489 CoreDataDemo[683:60b] Last Name= Branson2014-09-13 00:20:18.490 CoreDataDemo[683:60b] Age = 612014-09-13 00:20:18.490 CoreDataDemo[683:60b] First Name = Richard2014-09-13 00:20:18.491 CoreDataDemo[683:60b] Last Name= Branson2014-09-13 00:20:18.491 CoreDataDemo[683:60b] Age = 612014-09-13 00:20:18.495 CoreDataDemo[683:60b] Application windows are expected to have a root view controller at the end of application launch