Learning iOS Development: A Hands-on Guide to the Fundamentals of iOS Programming

Perfecting Portrait

There are models of the iPhone and iPod touch with different screen heights. Auto layout lets you create one set of constraints that works for all geometries and sizes. Right now, your layout is pixel-perfect for a 4-inch portrait display. In this section, you add constraints so it works with both 4-inch and 3.5-inch portrait displays.

Designing and adding constraints are part of the flow of designing and creating your user experience (UX). Figure 4-13 shows the general phases. First, you design your screen mockups, usually as part of the initial app specifications. When you start development, you do simple initial layout without using constraints. This is what you have done up to now with CarValet. In practice, initial designs ...