Before we can begin adding and using glances within our Shopping List application, we need to get a better understanding of how they work within the WatchKit framework. We did talk a bit about this in an earlier chapter, Chapter 2, Understanding Apple Watch, so much of this will be quite similar.
In the next section, we will talk a bit about the glance controller life cycle, and you will note that the glance controller inherits all of the existing functionalities of the
WKInterfaceController class and contains a variety of methods and calls that help determine whenever a glance becomes active or the controller context instance becomes awake.
The WatchKit glance interface controller is initialized at an early stage within your application so that it can be delivered to the user much more quickly. The glance interface controller is basically pretty much the same as any other view controller that comes...