Horizontal scroll view not scrolling

Question

I've just vertical scrolling a few times in the past, but now I'm trying to implement horizontal scrolling but when I run it it doesn't scroll.

What is the problem with it?

PS is it possible to design and layout views using a storyboard for scrolling? In this example the blue view is still visible within the screen representation, so its ok to deal with, but suppose I wanted to add another view which is further to the right and thus not visible within the screen representation? Is there anyway of visually designing a scroll view where you can see all the entirity within the storyboard what it will look like?

Answer 1

You don't have a trailing constraint on the scroll view's direct subview, so the scroll view cannot compute the correct contentSize .

Also, it's easier to understand the constraints in the document outline if you give each view a unique label. You have two views labelled “View” so it's difficult to be sure which constraints connect to which “View”.