IOS Core Data: Store custom objects Save Customize NSObject

idea: convert NSObject to NSData and then deposit 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 = @ "+";    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); }    }

the type of person in the model file is set to binary Data:

Both the person and birthday, both custom nsobject, need to use nscoding to implement Initwithcoder and Encodewithcoder two methods

Person

  person.h//  coredatatest//#import <Foundation/Foundation.h> #import "Birthday.h" @interface Person:nsobject<nscoding> @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 <Foundation/Foundation.h> @interface birthday:nsobject<nscoding> @property ( Strong, Nonatomic) NSString *year, @property (Strong, nonatomic) NSString *month; @property (Strong, nonatomic) NSString *d ay;-(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

Reference Links:

Http://sam.roon.io/archiving-objective-c-objects-with-nscoding

Https://coderwall.com/p/mx_wmq/how-to-save-a-nsarray-nsmutablearray-in-core-data

http://pinkstone.co.uk/how-to-save-a-uiimage-in-core-data-and-retrieve-it/

IOS Core Data: Store custom objects Save Customize NSObject