We’ll get more advanced, but this is a very basic mistake where you try to change the text for a in the attributes inspector, but fail to press enter so the label does not get updated.
In my experience though, 96% of the time, I uncheck that constrain to margins checkbox.
That said, even if you are just working alone, it really helps with organization.
Honestly, it seems natural, because we as programmers have very particular ways of organizing our code so why wouldn’t we at least have some way of organizing our UI.
Apple has made this as easy as possible now, with Xcode 7 and Storyboard References.
The problem for many in the past is that you start to get over 10 or 20 View Controllers and your one storyboard becomes hard to manage.