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Celestial is a video and image cache manager for iOS. It is available as a cocoapod dependency.

Displaying UIImages in UICollectionViews and UITableViews can be tricky sometimes. Especially when the images will be asynchronously downloaded from an external server. The time it takes for the image to finish downloading can affect the user's experience by causing the scrolling to 'lag' and in some cases be completely unresponsive for a second or two. And then there's the mess with threads... TL:DR, it gets messy. For videos, it can be another story entirely. Displaying videos in a scroll view has its own drawbacks. So this is where Celestial comes in. It provides a set of utility functions and views to streamline these often annoying processes.

It is intended to be used when downloading and displaying images and videos a single time from an external server. For example, displaying images in a UICollectionView can slow down scrolling if the image is repeatedly downloaded each time the cell is dequeued. Celestial will store the images or videos locally and provide them as necessary to the view. This prevents making redundant requests to the server, decreases image-display time and reduces the occurence of an incorrect image or video being loaded to an incorrect UICollectionViewCell or UITableViewCell. .