Why uncheck constraints to margin ?

Hi Diego,

If you were to place an empty view controller in your storyboard and then drag any other kind of view onto that view controller, near the edges of the view controller, you would see lines appear near the edges of the view controller. You may also see your view sort of snap to those lines.

Apple provides those lines as a way to see where the margins of the view controller are. Since most applications don't have their content, such as words and titles, butted up flush against the side of the view controller, those lines provide a reference to allow some padding between the content of your application and the side of the screen.

When Pasan unchecked the setting to pin to margins, he was basically telling Xcode to not use the margin as a buffer between the playlist art and view controller edges, and to instead go ahead and pin the playlist art to the sides of the view controller. This causes the playlist art to span from one side of the screen to the other side of the screen without having space between the sides of the playlist art and edge of the screen. That enabled Pasan to achieve the look that he was going for.