The Auto Layout System
Before you can fix the labels to be flexible in their layout, you need to learn a little of the theory behind the Auto Layout system.
Absolute coordinates make your layout fragile because they assume that you know the size of the screen ahead of time. Using Auto Layout, you can describe the layout of your views in a relative way that enables their frames to be determined at runtime so that the frames’ definitions can take into account the screen size of the device that the application is running on.
The alignment rectangle and layout attributes
The Auto Layout system is based on the alignment rectangle. This rectangle is defined by several layout attributes (Figure 3.16).
Figure 3.16 Layout ...
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