Combine Getting Started Guide

Learn Swift’s Combine framework through examples and sample code. A brief intro to publishers, operators, and subscribers.

What is Combine?

In short, Combine enables subscribing to output or values over time with a declarative API. For example, if you’re making a network request to fetch JSON.

Notice how Combine is built into url session, you’ll see it throughout Apple’s API ecosystem i.e notification center, timers.

1. Create a new data task publisher to fetch data at a URL.
2. Map on the response and get the Data via keypaths.
3. Decode the response into a dictionary.
4. CompactMap on the dictionary to the property results.
5. Replace errors with an empty array (throwing away the error).
6. Create a new publisher on the main queue.
7. Assign the subscription input to the text property on UILable.