Learning WatchKit Programming: A Hands-On Guide to Creating Apple Watch Applications

4. Interfacing with iOS Apps

Be a yardstick of quality. Some people aren’t used to an environment where excellence is expected.

Steve Jobs

In the previous chapter, you learned about the various controls that make up the user interface (UI) of an Apple Watch application. Many of the interactions occur between the storyboard and the code in the extension of the project. However, in real-world applications, your code in the extension could not do much (such as accessing web services or getting location information). This is because the extension only runs when the Apple Watch application is running in the foreground of the Apple Watch. A lot of times, the user’s interaction with your watch application is brief, and when the user stops interacting ...