SignUp Screen and use NSNotificationCenter defaultCenter for Show Hide Keyboard

– (void)viewDidLoad {

    [super viewDidLoad];

    

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

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

    

    UITapGestureRecognizer *aGest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected)];

    aGest.numberOfTapsRequired = 1;

    [self.ScrlViewSignUpVC addGestureRecognizer:aGest];

    

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

}

– (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

– (void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:UIKeyboardWillShowNotification

                                                  object:nil];

    

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:UIKeyboardWillHideNotification

                                                  object:nil];

}

#pragma mark – Gester method

– (void)tapDetected {

    [self.currentTextField resignFirstResponder];

}

#pragma mark – UIKeyboard show/hide notification

– (void)keyboardWillShow:(NSNotification *)iNotification {

    

    NSLog(@”%f”, [iNotification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height);

    NSDictionary *aKeyInfo = iNotification.userInfo;

    NSValue *aRectValue = [aKeyInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];

    CGRect aRect = [aRectValue CGRectValue];

    if (self.currentTextField.tag == 5 || self.currentTextField.tag == 6 || self.currentTextField.tag == 7) {

        self.ScrlViewSignUpVC.contentOffset = CGPointMake(0, (aRect.size.height) – 50);

    }

}

– (void)keyboardWillHide:(NSNotification *)iNotification  {

    self.ScrlViewSignUpVC.contentOffset = CGPointMake(0, 0);

}

#pragma mark – UITextField delegate

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

    [textField resignFirstResponder];

    return YES;

}

– (void)textFieldDidBeginEditing:(UITextField *)textField {

    self.currentTextField = textField;

}

Download Sample Project From GitHub