This function consumes a regular UIImage and returns a decompressed and rendered version. You can probably think of some potential improvements like decoding & rendering an image before one is assigned to the UIImageView. It can add up to a significant amount of work on the main thread, making your app unresponsive. rendering - copies and scales the image data from the image buffer into the frame buffer.decoding - converts encoded image data into per pixel image information.loading - loads compressed image into memory.The image rendering pipeline consists of several steps: The issue is that image rendering doesn’t happen at once when assigning one to be displayed by an image view. For example you might have a stutter while scrolling a table view with images. If your app downloads images from the web, a common challenge is application responsiveness and performance. As an alternative, you can replace it with any other solution that follows one of the cache replacement policies. In this article we’ll be using NSCache as internal image cache storage. In any case it is a better option for caching comparing to collection classes from the Swift standard library or Foundation framework. There are quite some pros of this class such as it being thread-safe and removing items from cache when memory is needed by other applications, but also some cons about it like having unclear eviction process.
While building a caching mechanism in iOS project most of the times you’d consider using NSCache class.
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In this article, I’ll show how to improve it by creating an Image Cache and integrate it with Image Loader using Combine framework. Eventually, it could be a source of unnecessary work when application reloads the same images multiple times.
That is the reason why downloading and displaying images in a mobile application is one of the most common tasks for app developers. On Swift Wings All posts Tags About Reusable Image Cache in SwiftĪlmost every application contains some kind of graphics.
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