3. Responding to User Actions

If you haven’t found it yet, keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it. And like any great relationship, it just gets better and better as the years roll on.

Steve Jobs

Designing the user interface (UI) for your Apple Watch application is similar to designing for the iPhone. However, space is at a premium on the Apple Watch, and every millimeter on the screen must be put to good use in order to convey the exact intention of your app.

The UI of an Apple Watch application is represented by various controls (commonly known as views in iOS programming), and they are divided into two main categories:

Responding to user actions: Users directly interact with these controls ...

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