Core Data Tute 2 (Add / Delete / Search)

Core Data Tute 2 (Add / Delete / Search)

Step 1

Create a project like previous tutorial .... 

http://adrianmobileapplication.blogspot.com/2013/07/core-data-in-ios-for-beginners.html

Step 2

Create Entity & Attribute   like this...

Step 3

Add new Class call "ViewController" Class with ".xib" like Previous tutorial 

http://adrianmobileapplication.blogspot.com/2013/07/core-data-in-ios-for-beginners.html

and Design this UI in ViewControler.xib

Step 4

change the code in "ViewController.h" class . 

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *studentNoTextField;

@property (weak, nonatomic) IBOutlet UITextField *studentNameTextField;

@property (weak, nonatomic) IBOutlet UILabel *displayLable;

- (IBAction)add:(id)sender;

- (IBAction)search:(id)sender;

- (IBAction)deleteStudent:(id)sender;

@end

------------------------------------------------------------------------------------------------------------------------

Step 5

Change the code in  "ViewController.m" class. In here You have to Import AppDelegate class

#import "ViewController.h"

#import "AppDelegate.h"

@interface ViewController ()

{

NSManagedObjectContext *context;

}

@end

@implementation ViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

}

return self;

}

// for hide the key board-----------------------------------

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

return [textField resignFirstResponder];

}

- (IBAction)add:(id)sender {

NSEntityDescription *entityDes=

[NSEntityDescription entityForName:@"Student" inManagedObjectContext:context];

NSManagedObject *newStudent =

[[NSManagedObject alloc]initWithEntity:entityDes insertIntoManagedObjectContext:context];

[newStudent setValue:self.studentNameTextField.text forKey:@"studentName"];

[newStudent setValue:self.studentNoTextField.text forKey:@"studentNo"];

NSError *error;

[context save:&error];

self.displayLable.text=@"Student Added";

_studentNoTextField.text=@"";

_studentNameTextField.text=@"";

}

- (IBAction)deleteStudent:(id)sender{

NSEntityDescription *entityDes=

[NSEntityDescription entityForName:@"Student" inManagedObjectContext:context];

NSFetchRequest *request=[[NSFetchRequest alloc]init];

[request setEntity:entityDes];

//we use "==" to get exact match-------------------------------------------------

NSPredicate *predicate=[NSPredicate predicateWithFormat:@"studentNo == %@",self.studentNoTextField.text];

[request setPredicate:predicate];

NSError *error;

NSArray *machingData=[context executeFetchRequest:request error:&error];

if(machingData.count<=0)

{

self.displayLable.text=@"No Student Deleted";

}

else{

// int count=0;

for(NSManagedObject *obj in machingData){

[context deleteObject:obj];

//++count;

}

[context save:&error];

// self.displayLable.text=[NSString stringWithFormat:@"%d Student deleted : ",count];

self.displayLable.text=[NSString stringWithFormat:@"Student deleted"];

}

}

- (IBAction)search:(id)sender {

NSEntityDescription *entityDes=

[NSEntityDescription entityForName:@"Student" inManagedObjectContext:context];

NSFetchRequest *request=[[NSFetchRequest alloc]init];

[request setEntity:entityDes];

//we use "==" to get exact match-------------------------------------------------

NSPredicate *predicate=[NSPredicate predicateWithFormat:@"studentNo == %@",self.studentNoTextField.text];

[request setPredicate:predicate];

NSError *error;

NSArray *machingData=[context executeFetchRequest:request error:&error];

if(machingData.count<=0)

{

self.displayLable.text=@"No Person Found";

}

else{

NSString *sno;

NSString *sName;

for(NSManagedObject *obj in machingData){

sno=[obj valueForKey:@"studentNo"];

sName=[obj valueForKey:@"studentName"];

}

self.displayLable.text=[NSString stringWithFormat:@"Student No : %@ , Student Name : %@ ",sno,sName];

NSLog(@"display :studentNo %@ ,studentName %@ ",sno,sName);

}

}

- (void)viewDidLoad

{

AppDelegate *appDelegate=[[UIApplication sharedApplication]delegate];

context=[appDelegate managedObjectContext];

[super viewDidLoad];

// Do any additional setup after loading the view from its nib.

[[self studentNameTextField]setDelegate:self];

[[self studentNoTextField]setDelegate:self];

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

------------------------------------------------------------------------------------------------------------------------------

Step 6

same like previous tutorial you have to set ViewController as a RootViewController in AppDelegate.

To do that....

"- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions"  method in AppDelegate.h

#import "ViewController.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// Override point for customization after application launch.

ViewController *rootViewController=

[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

[self.window setRootViewController:rootViewController];

self.window.backgroundColor = [UIColor whiteColor];

[self.window makeKeyAndVisible];

return YES;

}

2 . After Click Search Button

Step 7                                                                                     

Run your App

1

3.After Click the add Button

Good Luck!

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