IRImagery

IRImagery holds a collection of helper classes and views that work with images, specifically UIImage objects.

Sample

Look at the Sample App.

Useful Classes and Methods

IRImageView

IRImageView is designed to be a drop-in replacement of UIImageView. It overrides -setImage: to decode the image in background, create a fully in-memory representation of the image in the correct scale and orientation, then send it back to the image view, preventing decoding to happen on the main thread.

UIImage additions

• -[UIImage irStandardImage] creates a point-for-pixel image from self, and does orientation rotation for you, so the final image is suitable for all sorts of processing and guaranteed to be up-side-up.

• -[UIImage irDecodedImage] creates an in-memory CGImageRef-backed image using -irStandardImage, and the result is guaranteed to be “hot” and in memory, suitable for immediate display by being trampolined to the main thread.

• -[UIImage irSetRepresentedObject:] and -[UIImage irRepresentedObject:] provides a basic level of support for describing multiple image representations against one single truth, e.g. multiple thumbnail images of different sizes.

• -[UIImage irWriteToSavedPhotosAlbumWithCompletion:] provides a callback block, instead of a selector invocation.

IRImagePageView

IRImagePageView is a simple page view that contains a scrollable, pannable, zoomable view hosting an image. It uses IRImageView internally, and can be used in junction with IRPaginatedView to build a scrollable gallery.

Credits

• Evadne Wu at Iridia Productions / Waveface Inc.
• Trevor Harmon for the original UIImage+Resize implementation