Image Caching in Swift

Episode 1

Cancelling Image Requests

10:19

Most applications display images in some way, shape, or form. Those images are often fetched from a remote server, introducing a number of interesting challenges. Performing a request to a remote server takes time and it requires resources. It is therefore important to consider solutions to minimize the number of requests an application makes.

Episode 2 Plus

Caching Images in Memory

09:44

We added the ability to cancel image requests in the previous episode. This and the next episode focus on caching images. We start simple by caching images in memory.

Episode 3 Plus

Caching Images on Disk

09:27

In this episode, we continue to improve the solution we implemented in this series by caching images on disk. Caching images on disk has a number of benefits. It reduces the number of requests the application makes and it improves the performance of the application. The user experiences the application as fast and snappy.

Episode 4 Plus

Asynchronously Reading Data from Disk

10:41

The previous episodes have illustrated that caching images can result in significant performance improvements. In the previous episode, I stressed the importance of writing cached images to disk on a background thread to prevent the image service from blocking the main thread.