In the past couple of years, I have spoken to several aspiring iOS developers about what kind of hobby app they should make after escaping the tutorial trap. By “hobby app”, I mean an app for which one does not intend to be paid at all by an employer or enough by users to cover one’s living expenses. As someone who used hobby apps to jump-start his iOS-development career and who continues to develop hobby apps, I am interested in this question. I share my thinking in this post with the hope of providing thought-food to anyone considering development of a hobby app.

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Dependency injection makes unit testing possible and development easier. This post describes the process of preparing an app for dependency injection, as well as implementing three approaches to dependency injection: constructor injection, Swinject, and The World.

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In a tutorial I created last year, I described advantages of programmatic layout (PL) over Interface Builder (IB). I recently became aware of another: PL permits use of non-optional, constant properties of view controllers. IB does not. I share this advantage here for the benefit of readers.

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