Part IV. Creating a Beautiful App Without Falling Victim to Memory Issues—OpenGL, Skinning, Object Reuse, and Coding Efficiently

Building an app with beauty as well as brains can be an expensive process, so it's no wonder that the developers of the two apps in this section, Postage and Delicious Library, talk as much about their use of art as they do the deeply technical issues of memory management. But investing in aesthetics isn't enough. Good looks may wins impulse buyers, but it's an app's brains that keep those buyers using it long after they've come across competitors.

Postage is one of the friendliest single-purpose apps in the App Store, conceived originally with the developers' wives in mind: it lets you take a photo, choose a theme, and ...

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