Core Data in IOS (for Beginners)

Core Data in IOS (for Beginners)

Introduction
Core Data is a schema-driven object graph management and persistence framework. 
Fundamentally, Core Data helps you to save model objects (in the sense of the model-view-controller design pattern) to a file and get them back again.

Core Data is available on iOS 3.0 and later.

Reference : - http://developer.apple.com/library/ios/#documentation/DataManagement/Conceptual/iPhoneCoreData01/Introduction/Introduction.html 

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What i am going to do is...

Step 1

Create a ARC Project ....

Click the ARC also

Step 2

Click the "CoreDataTute.xdatamodeled"

Click Add Entity icon and type Student(Table name)

 Click the plus Sign to add Attribute

Step 3

click this icon to see the table

Step 4

Add new class for your Project

Step 5

Type this code in your  .h class (which you add new class in above)

#import <UIKit/UIKit.h>

@interface InsertDataViewController : UIViewController

{

 IBOutlet UITextField *nameField;

}

-(IBAction)save;

-(IBAction)Fetch;

@end

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

Step 6

Type this code in your  .m class (which you add new class in above)

Import the "AppDelegate.h"  .m class to your class

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

#import "InsertDataViewController.h"

#import "AppDelegate.h"

@interface InsertDataViewController ()

@end

@implementation InsertDataViewController

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

{

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

if (self) {

// Custom initialization

}

return self;

}

- (void)viewDidLoad

{

[super viewDidLoad];

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

}

-(IBAction)save{

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

//Entity for table name : Team

NSEntityDescription *entity=[NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:appDelegate.managedObjectContext];

//set value for the column name

[entity setValue:nameField.text forKey:@"name"];

NSError *error;

//its returns true when values inserted in database succesfuly otherwise false

BOOL isSaved= [appDelegate.managedObjectContext save:&error]; 

NSLog(@"Successfully Saved : flags @%d",isSaved);

}

-(IBAction)Fetch{

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

//create Entity object for Table : Student

NSEntityDescription *entity=[NSEntityDescription entityForName:@"Student" inManagedObjectContext:appDelegate.managedObjectContext];

//create fetch request

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

[fetchRqst setEntity:entity];

//Get all rows in mutable array

NSMutableArray *array=[[appDelegate.managedObjectContext executeFetchRequest:fetchRqst error:nil]mutableCopy];

//Core data return each row as managed object so we can access rows values through key value pair

for(NSManagedObject *obj in array)

{

   NSLog(@"SLIIT Student Names: %@\n",[obj valueForKey:@"name"]);

}

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

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Step 7

Design the following Ui and Connect those Method like this.....

Step 8

 go to the AppDelegate.m class and set Above viewController(in my case it is  InsertDataViewController)  as a Root View Controller

 to do that import view controller Header file to the AppDelegate.h class 

and change the code of   

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

#import "InsertDataViewController.h"

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

{

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

// Override point for customization after application launch.

InsertDataViewController *rootViewController=

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

[self.window setRootViewController:rootViewController];

self.window.backgroundColor = [UIColor whiteColor];

[self.window makeKeyAndVisible];

return YES;

}

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Step 9

Run Your App & insert some data and Click the fetch button ....

• After click Save Button

this mean your successfully  added .................!

• After Click Fetch Button

Good Luck!

Tutorial List

1. SQLite Based iPhone Application
2. json with IOS (Basic) - Tutorial
3. Simple Table View in IOS
4. Load Distinct Images from array into UITableView
5. Simple UIPickerView Example
6. Tab Bar Application Part 1
7. Tab Bar Application Part 2
8. Tab Bar Application Part 3 ( with Login Screen )
9. Tab Bar Application Part 4 ( Navigation )
10. Table View Design in IOS Part 1
11. Table View Design in IOS Part 2 ( Time Table )
12. How to Add search bar in Table View
13. Local Notification in IOS
14. Core Data (For Beginners )
15. Core Data Tute 2 (Add/Delete/Search)
16. Core Data Tute 3 (Two table)
17. Custom Cell in UITableview
18. Lazy Loading
19. Pull to Refresh in TableView
20. Working with keyboard in Objective C - Part 1 

Local Notification in IOS

Local Notification in IOS

Step 1

Design this

  

Step 2

add this code in "viewController.h" 

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

{

    IBOutlet UITextField *message;

}

@property (nonatomic, retain) UITextField *message;

-(IBAction) btnSet:(id) sender;

-(IBAction) btnCancelAll:(id) sender;

@end

Step 3

type this code in "viewController.m" 

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize message;

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

-(IBAction) btnSet:(id) sender

{

    

    UILocalNotification *localNotification = [[UILocalNotification alloc] init];

    

    //---set the notification to go off in 10 seconds time---

    localNotification.fireDate =

    [[NSDate alloc] initWithTimeIntervalSinceNow:10];

    

    //---the message to display for the alert---

    localNotification.alertBody = message.text;

    

    localNotification.applicationIconBadgeNumber = 1;

   

    //---uses the default sound---

    localNotification.soundName = UILocalNotificationDefaultSoundName;

    

    //---title for the button to display---

    localNotification.alertAction = @"View Details";

    

   //---schedule the notification---

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

    [localNotification release];

}

-(IBAction) btnCancelAll:(id) sender

{

    //---cancel all notifications---

    [[UIApplication sharedApplication] cancelAllLocalNotifications];

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

Step 4

add this method in "AppDelegate.m" 

- (void) application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {

    

    

    UIAlertView *alert = [[UIAlertView alloc]

                          initWithTitle:@"Inside application Receive Local Notification "

                          message:notification.alertBody

                          delegate:self

                          cancelButtonTitle:@"OK"

                          otherButtonTitles:nil];

    application.applicationIconBadgeNumber = 0;

    

    [alert show];

    [alert release];

     

}

Step 5

Step 6

Run Your app

Type Something 

After 10 Second

          

Click the Notification

Good Luck!

Tutorial List

1. SQLite Based iPhone Application
2. json with IOS (Basic) - Tutorial
3. Simple Table View in IOS
4. Load Distinct Images from array into UITableView
5. Simple UIPickerView Example
6. Tab Bar Application Part 1
7. Tab Bar Application Part 2
8. Tab Bar Application Part 3 ( with Login Screen )
9. Tab Bar Application Part 4 ( Navigation )
10. Table View Design in IOS Part 1
11. Table View Design in IOS Part 2 ( Time Table )
12. How to Add search bar in Table View
13. Local Notification in IOS
14. Core Data (For Beginners )
15. Core Data Tute 2 (Add/Delete/Search)
16. Core Data Tute 3 (Two table)
17. Custom Cell in UITableview
18. Lazy Loading
19. Pull to Refresh in TableView
20. Working with keyboard in Objective C - Part 1 

How to Add a Search Bar in Table View

How to Add a Search Bar in Table View

Step1

     create a Project  by using" single view  application"

Step2

       Add  this code to ViewController.h file

//

//  ViewController.h

//  SearchBAr2

//

//  Created by Dhanushka Adrian on 6/26/13.

//  Copyright (c) 2013 Adrian. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITabBarDelegate,UITableViewDataSource,UISearchBarDelegate>

{

    IBOutlet UITableView *tableView;

    IBOutlet UISearchBar *searchBAr;

    NSArray *allItem;

    NSMutableArray *displayItems;

    

}

@end

Step 3

    add UISearchBar & UITableView

Step 4

connect searchbar

Step 5

In ViewController change code like this

//

//  ViewController.h

//  SearchBAr2

//

//  Created by Dhanushka Adrian on 6/26/13.

//  Copyright (c) 2013 Adrian. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    allItem=[[NSArray alloc] initWithObjects:@"Supun",@"Adrian",@"Dhanushka",@"Kasun",@"Damith",@"Chamitha",@"Thilina",@"Asela",@"Shanika",@"Chandrakantha",@"Tharidu", nil];

    displayItems=[[NSMutableArray alloc] initWithArray:allItem];

    

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardHidden:) name:UIKeyboardWillHideNotification object:nil];

// Do any additional setup after loading the view, typically from a nib.

}

//

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

    

    return  1;

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    

    return  [displayItems count];

    

}

-(UITableViewCell *)tableView:(UITableView *)atableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    //static NSString *simpleTableIdentifier = @"SimpleTableItem";

    

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    

    if (cell == nil) {

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];

    }

    

    cell.textLabel.text = [displayItems objectAtIndex:indexPath.row];

    return cell;

}

                      

//when user type text in search bar ........(textChange)

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

{

    

    if([searchText length] == 0)//if there nothig in search field

    {

        [displayItems removeAllObjects];

        [displayItems addObjectsFromArray:allItem];

    }

    else

    {

       [displayItems removeAllObjects];

        

        for(NSString *string in allItem)//every single item in allItem array

        {

            NSRange r=[string rangeOfString:searchText options:NSCaseInsensitiveSearch];//where it is

            

           

            if(r.location!=NSNotFound)

            {

                [displayItems addObject:string];

            }

        }

       

        

    

    }

    

    [tableView reloadData];

}

-(void)keyboardHidden:(NSNotification *)note

{

      [tableView reloadData];

}

-(void)keyboardShown:(NSNotification *)note{

    

    CGRect keyboardFrame;

    

    [[[note userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey]getValue:&keyboardFrame];

    

}

//handle the search button click in keyboard------------

- (void)searchBarSearchButtonClicked:(UISearchBar *)asearchBar

{

    

    [asearchBar resignFirstResponder];

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

Step 6

Run the App

  

Good Luck!

Tutorial List

1. SQLite Based iPhone Application
2. json with IOS (Basic) - Tutorial
3. Simple Table View in IOS
4. Load Distinct Images from array into UITableView
5. Simple UIPickerView Example
6. Tab Bar Application Part 1
7. Tab Bar Application Part 2
8. Tab Bar Application Part 3 ( with Login Screen )
9. Tab Bar Application Part 4 ( Navigation )
10. Table View Design in IOS Part 1
11. Table View Design in IOS Part 2 ( Time Table )
12. How to Add search bar in Table View
13. Local Notification in IOS
14. Core Data (For Beginners )
15. Core Data Tute 2 (Add/Delete/Search)
16. Core Data Tute 3 (Two table)
17. Custom Cell in UITableview
18. Lazy Loading
19. Pull to Refresh in TableView
20. Working with keyboard in Objective C - Part 1