keyboard animation

gistfile1.m

- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];
    NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGFloat duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    CGSize keyboardSize = [aValue CGRectValue].size;

    CGRect viewFrame = CGRectMake(0,
                                  0,
                                  UI_SCREEN_WIDTH,
                                  self.View.frame.size.height - keyboardSize.height);

    [UIView animateWithDuration:duration animations:^{
        self.view.frame = viewFrame;
    }];
}