Swift 4 Protocol-Oriented Programming - Third Edition

Implementing the proxy pattern

In this section, we will look at how we can use the proxy pattern to put a layer of abstraction between our code and a remote API. This will enable us to hide the implementation details of the remote API within the local proxy type. For this example, we will create a proxy type that will retrieve information from Apple's iTunes API.

For this example to work, we will need to implement the networking code within the proxy type to interact with Apple's iTunes API. While we will show the code, we will not cover how it works. Instead we are going to focus on how the proxy pattern is implemented.

To implement this pattern, we will need to begin by creating a type that will act as the proxy for the iTunes API. Since ...