Keybord notifications in OS

Keybord+Notification+iOS.mm

/*
UIKeyboardWillShowNotification
UIKeyboardDidShowNotification
UIKeyboardWillHideNotification
UIKeyboardDidHideNotification
*/




- (void)viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:)        
                                                 name:@"UIKeyboardWillShowNotification" 
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardDidHide:)        
                                                 name:@"UIKeyboardDidHideNotification" 
                                               object:nil];
}


- (void) keyboardWillShow:(NSNotification *)note {
    NSDictionary *userInfo = [note userInfo];
    CGSize kbSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    
    NSLog(@"Keyboard Height: %f Width: %f", kbSize.height, kbSize.width);

    // move the view up by 30 pts 
    CGRect frame = self.view.frame; 
    frame.origin.y = -30;
    
    [UIView animateWithDuration:0.3 animations:^{
        self.view.frame = frame;
    }];
}

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

    // move the view back to the origin
    CGRect frame = self.view.frame; 
    frame.origin.y = 0;
    
    [UIView animateWithDuration:0.3 animations:^{
        self.view.frame = frame;
    }];
}


- (void) dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    // uncomment for non-ARC:
    // [super dealloc];
}