Loading UIImage in background thread causes ImageIO error

Question

I am working on an iOS project that loads UIImages from URLs in a background thread and displays them in a horizontally paged scroll view. This behavior should mimic that of the

Answer 1

UIKit is not a thread-safe class. Therefore, you should not call UIImage from the background.

Rather than create UIImages, render your images files into CGImageRefs. You can pass one of these back to the main thread and generate a UIImage from that (you will have still benefited by moving the heavy-lifting of image decompression to the background).