The classes in this repository make it easy to download images asynchronously in your iPhone/iPad app.
Blocks are used extensively so you need to be targetting at least iOS 4.0. Class extensions are also used, so you need to use the LLVM Compiler. To use these classes you need to have SDURLCache present as well.
This simplest usage is to pass an NSURL instance to any UIImageView instance:
NSURL *anImageURL = [NSURL URLWithString:@"http://www.example.com/remoteimage.png"];
[myImageView kv_setImageAtURL:anImageURL];
Use -kv_setImageAtURL:showActivityIndicator:activityIndicatorStyle:loadingImage:notAvailableImage: if you want to for example show a local image instead if the URL returned a 404.
If you need to remove the UIImageView instance from screen, call -kv_cancelImageDownload first so that images are not downloaded needlessly. Your instance is also retained whilst the download is active. If you fail to send the cancel message to your UIImageView instance, it will stay in memory until the download has completed.
[myImageView kv_cancelImageDownload];
For more advanced usage, use KVImageCache directly:
NSURL *anImageURL = [NSURL URLWithString:@"http://www.example.com/remoteimage.png"];
[[KVImageCache defaultCache] loadImageAtURL:anImageURL withHandler:^(UIImage *image) { // Do something with image }];
The check in KVImageCache for local images allows the URL to be either "localimage.png" or "http://www.example.com/remoteimage.png". This way it is possible to point to a file already included in the app's bundle.
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Johan Kool is an developer of iOS and Mac OS X (Cocoa and Cocoa touch) software. If you wish to hire me, please look at www.koolistov.net/services.
-- Thanks!
Johan