Working with keyboard in Objective C - Part 1

                                            Working with keyboard in Objective C  -  Part 1 

    Main Methods        

•     Displaying Keyboard 

                   becomeFirstResponder method

•      Dismiss Keyboard 

                  resignFirstResponder method

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

01. Displaying keyboard  when view open

- (void)viewDidLoad

{

    [super viewDidLoad];

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

    [self.nameTextField becomeFirstResponder];

}

02. Keyboard to hide when the user taps outside of the text field 

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

   

    [self.nameTextField resignFirstResponder];

    [self.emailTextField resignFirstResponder];

    [self.phoneNumberTextField resignFirstResponder];

   

}

03. Keyboard to hide when you press the return or done button of the keyboard 

.h

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

#import <UIKit/UIKit.h>

@interface KeyboardViewController : UIViewController <UITextFieldDelegate>

@property(nonatomic,retain)IBOutlet UITextField *nameTextField;

@property(nonatomic,retain)IBOutlet UITextField *emailTextField;

@property(nonatomic,retain)IBOutlet UITextField *phoneNumberTextField;

@end

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

.m

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

- (void)viewDidLoad

{

    [super viewDidLoad];

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

   [self.nameTextField becomeFirstResponder];

    self.nameTextField.delegate = self;

    self.phoneNumberTextField.delegate = self;

    self.emailTextField.delegate = self;

   

        

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

      

    [self.nameTextField resignFirstResponder];

    [self.emailTextField resignFirstResponder];

    [self.phoneNumberTextField resignFirstResponder];

   

    return NO;

   

}

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

04. UITextField move up when keyboard is present

.h

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

 #import <UIKit/UIKit.h>

@interface KeyboardViewController : UIViewController<UITextFieldDelegate>

@property(nonatomic,retain)IBOutlet UITextField *nameTextField;

@property(nonatomic,retain)IBOutlet UITextField *emailTextField;

@property(nonatomic,retain)IBOutlet UITextField *phoneNumberTextField;

@property(nonatomic,retain)IBOutlet UIScrollView *backGroundScroll;

@property(nonatomic,retain)IBOutlet UIButton *registerButton;

@end

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

.m

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

#import "KeyboardViewController.h"

@interface KeyboardViewController ()

@end

@implementation KeyboardViewController

- (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.

   

    self.nameTextField.delegate = self;

    self.phoneNumberTextField.delegate = self;

    self.emailTextField.delegate = self;

   

   

   

    [self.nameTextField becomeFirstResponder];

   

   

}

    

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

    [self.nameTextField resignFirstResponder];

    [self.emailTextField resignFirstResponder];

    [self.phoneNumberTextField resignFirstResponder];

   

    return NO;

   

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)viewWillAppear:(BOOL)animated {

   

    [super viewWillAppear:animated];

   

    [self registerForKeyboardNotifications];

   

}

- (void)viewWillDisappear:(BOOL)animated {

   

    [self deregisterFromKeyboardNotifications];

   

    [super viewWillDisappear:animated];

   

}

- (void)registerForKeyboardNotifications {

   

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWasShown:)

                                                 name:UIKeyboardDidShowNotification

                                               object:nil];

   

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillBeHidden:)

                                                 name:UIKeyboardWillHideNotification

                                               object:nil];

   

}

- (void)deregisterFromKeyboardNotifications {

   

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:UIKeyboardDidHideNotification

                                                  object:nil];

   

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:UIKeyboardWillHideNotification

                                                  object:nil];

   

}

- (void)keyboardWasShown:(NSNotification *)notification {

   

    NSDictionary* info = [notification userInfo];

   

    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

   

    CGPoint buttonOrigin = self.registerButton.frame.origin;

   

    CGFloat buttonHeight = self.registerButton.frame.size.height;

   

    CGRect visibleRect = self.view.frame;

   

    visibleRect.size.height -= keyboardSize.height;

   

    if (!CGRectContainsPoint(visibleRect, buttonOrigin)){

       

        CGPoint scrollPoint = CGPointMake(0.0, buttonOrigin.y - visibleRect.size.height + buttonHeight);

       

        [self.backGroundScroll setContentOffset:scrollPoint animated:YES];

       

    }

   

}

- (void)keyboardWillBeHidden:(NSNotification *)notification {

   

    [self.backGroundScroll setContentOffset:CGPointZero animated:YES];

   

}

@end

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

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