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You have been using Auto Layout throughout this book to create flexible interfaces that scale across device types and sizes. Auto Layout is a very powerful technology, but with that power comes complexity. Laying out an interface well often needs a lot of constraints, and it can be difficult to create dynamic interfaces due to the need to constantly add and remove constraints.
Often, an interface (or a subsection of the interface) can be laid out in a linear fashion. Think about the other applications you wrote: The Quiz application from Chapter 1 consisted of four subviews that were laid out vertically. The same is true for the WorldTrotter application; the ConversionViewController had a vertical interface consisting ...
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