IOS Core Data: stores the Custom object Save Custom NSObject

IOS Core Data: stores the Custom object Save Custom NSObject

Ideas:Convert NSObject to NSData and store NSData into Core Data.

Core Data Implementation

Add data:

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];    NSManagedObjectContext *context = [appDelegate managedObjectContext];    NSManagedObject *newContact;    newContact = [NSEntityDescription insertNewObjectForEntityForName:@Contact inManagedObjectContext:context];        Person *person = [[Person alloc] init];    person.name = @Xiaoming;    person.number = @1008610086;        Birthday *birthday = [[Birthday alloc] init];    birthday.year = @2000;    birthday.month = @January;    birthday.day = @1st;    person.birthday = birthday;    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:person];    [newContact setValue:data forKey:@person];        NSError *error;    [context save:&error];

Get data:

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];    NSFetchRequest *request = [[NSFetchRequest alloc] init];    NSManagedObjectContext *context = [appDelegate managedObjectContext];    NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@Contact inManagedObjectContext:context];    [request setEntity:entityDesc];        NSManagedObject *matches = nil;        NSError *error;    NSArray *objects = [context executeFetchRequest:request                                              error:&error];        if ([objects count] == 0)    {        NSLog(@No matches);    }    else    {        for (int i = 0; i < [objects count]; i++)        {            matches = objects[i];            NSData *data = [matches valueForKey:@person];            Person *person = [NSKeyedUnarchiver unarchiveObjectWithData:data];            NSLog(@My name is %@. I was born on %@ %@, %@. My phone number is %@, person.name, person.birthday.month, person.birthday.day, person.birthday.year, person.number);        }    }

In the Model file, set the person type to Binary Data:

 

 

Both the custom NSObject "Person" and "Birthday" must use NSCoding to implement the initWithCoder and encodeWithCoder methods.

Person

////  Person.h//  CoreDataTest//#import 
 
  #import Birthday.h@interface Person : NSObject
  
   @property (strong, nonatomic) NSString *name;@property (strong, nonatomic) NSString *number;@property (strong, nonatomic) Birthday *birthday;- (id)init;@end
  
 

////  Person.m//  CoreDataTest//#import Person.h@implementation Person- (id)init{    self.name  = nil;    self.number  = nil;        return self;}- (id)initWithCoder:(NSCoder *)decoder{    if (self = [super init]){        self.name  = [decoder decodeObjectForKey: @name];        self.number  = [decoder decodeObjectForKey: @number];        self.birthday = [decoder decodeObjectForKey: @birthday];    }        return self;}- (void)encodeWithCoder:(NSCoder *)encoder{    [encoder encodeObject:self.name forKey:@name];    [encoder encodeObject:self.number forKey:@number];    [encoder encodeObject:self.birthday forKey:@birthday];}@end

Birthday

////  Birthday.h//  CoreDataTest//#import 
 
  @interface Birthday : NSObject
  
   @property (strong, nonatomic) NSString *year;@property (strong, nonatomic) NSString *month;@property (strong, nonatomic) NSString *day;- (id)init;@end
  
 

////  Birthday.m//  CoreDataTest//#import Birthday.h@implementation Birthday- (id)init{    self.year  = nil;    self.month  = nil;    self.day  = nil;    return self;}- (id)initWithCoder:(NSCoder *)decoder{    if (self = [super init]){        self.year  = [decoder decodeObjectForKey: @year];        self.month  = [decoder decodeObjectForKey: @month];        self.day = [decoder decodeObjectForKey: @day];    }        return self;}- (void)encodeWithCoder:(NSCoder *)encoder{    [encoder encodeObject:self.year forKey:@year];    [encoder encodeObject:self.month forKey:@month];    [encoder encodeObject:self.day forKey:@day];}@end