I am using auto layout for a controller under navigation controller. For this controller, I mainly have a scroll view inside the controller's view. the alignment rule for the scroll view is top layout guide, bottom layout guide, leading aligned with super view and trailing as well.
the layout is fine when I load the view at first , then I pressed the add a description button, it pushes to next screen and after that the screen is going to show up again, but it becomes like this now .
there is some mysterious white space between the navbar and the scroll view all of sudden. my guess is that the top layout guide is misplaced. anyway I can fix this or anything I have done wrongly?