- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    TaskDetailViewController *detailViewController = segue.destinationViewController;
    detailViewController.task = sender;
    
    // create animator object with instance of modal view controller
    // we need to keep it in property with strong reference so it will not get release
    self.animator = [[ZFModalTransitionAnimator alloc] initWithModalViewController:detailViewController];
    self.animator.dragable = YES;
    self.animator.direction = ZFModalTransitonDirectionBottom;
    [self.animator setContentScrollView:detailViewController.scrollview];
    
    // set transition delegate of modal view controller to our object
    detailViewController.transitioningDelegate = self.animator;
    detailViewController.modalPresentationStyle = UIModalPresentationCustom;
}

[self.animator setContentScrollView:detailViewController.scrollview];

self.animator.direction = ZFModalTransitonDirectionBottom;