Hands-On Design Patterns with Swift

Asynchronous networking – an example

Now we can take a look at a slightly more compelling example, showing off the power of reactive programming. Let's get back to our previous example: a UISearchBar collects user input that a view controller observes, to update a table displaying the result of a remote query. This is a pretty standard UI design. Using RxCocoa, we can observe the text property of the search bar and map it into a URL. For example, if the user inputs a GitHub username, the URLRequest could retrieve a list of all their repositories. We then further transform the URLRequest into another observable using flatMap. The remoteStream function is defined in the following snippet, and simply returns an observable containing the result ...