animations: show and remove views with animation

animation slide up - slide down

//Showing view from bottom of the paren view (navigationController.view)
+ (void) showView:(UIView *)childView inParentView:(UIView *)parentView withTag:(int)tag
{
    float animationTime = 0.3;
    CGRect frame = CGRectMake(parentView.frame.origin.x, parentView.frame.size.height, childView.frame.size.width, childView.frame.size.height);
    childView.tag = tag;
    [parentView addSubview:childView];
    [UIView transitionWithView:childView duration:animationTime options:UIViewAnimationOptionCurveEaseInOut animations:^{
        [childView setFrame:CGRectMake(frame.origin.x, parentView.frame.size.height - childView.frame.size.height, frame.size.width, frame.size.height)];
    } completion:nil];
}

//Remove view from tag from current position to bottom edges of parent view
+ (void) removeViewWithTag:(int)tag fromParentView:(UIView *)parentView
{
    float animationTime = 0.3;
    for (UIView *v in [parentView subviews]){
        if (v.tag == tag) {
            [UIView transitionWithView:v duration:animationTime options:UIViewAnimationOptionCurveEaseInOut animations:^{
                [v setFrame:CGRectMake(v.frame.origin.x, parentView.frame.size.height, v.frame.size.width, v.frame.size.height)];
            } completion:^(BOOL finished){
                if (finished)
                    [v removeFromSuperview];
            }];
            break;
        }
    }
}