Glances were first introduced in WatchKit 1.0 and are basically a way in which your users can view important information from within your app. A glance is a means of providing relevant information immediately in a timely manner.
Glances are basically an extension of your Apple Watch app that can present information to the user without the need of launching your Apple Watch app and are basically the equivalent of the Today extension in iOS.
Since glances inherit from the WKInterfaceController class, they don't require you to include any delegate callbacks within your code, so you can easily create these using Interface Builder and then connect each of the Interface Builder objects to their respective Outlets.
In this chapter, we will begin by providing an overview of WatchKit glances and their life cycle before working through an application that builds upon our Shopping List application, which we built in the previous chapter, involving...