resizing view on keyboard apperance/disapperance

gistfile1.m

#pragma mark - Handle Keyboard Appearance/Disappearance
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGRect kbRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
	kbRect = [self.view convertRect:kbRect toView:nil];

    CGRect viewRect = [self.view convertRect:self.view.frame fromView:nil];
    CGRect newRect = CGRectMake(viewRect.origin.x
                                ,viewRect.origin.y
                                ,viewRect.size.width
                                ,viewRect.size.height-kbRect.size.height);
    self.view.frame = [self.view convertRect:newRect toView:nil];
}

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

    NSDictionary* info = [aNotification userInfo];
    CGRect kbRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
	kbRect = [self.view convertRect:kbRect toView:nil];
    
    CGRect viewRect = [self.view convertRect:self.view.frame fromView:nil];
    CGRect newRect = CGRectMake(viewRect.origin.x
                                 ,viewRect.origin.y
                                 ,viewRect.size.width
                                 ,viewRect.size.height+kbRect.size.height);
    self.view.frame = [self.view convertRect:newRect toView:nil];
}