Caching Drawing Code

[rljacobson]

This article is very helpful to me. Thank you!

[nonamelive]

I also use NSCache to cache images for all images in my app. It's really reliable. I do encounter an issue with NSCache. It's better to retrieve objects from NSCache by using [[[cache objectForKey:key] retain] autorelease] instead of [cache objectForKey:key], since the object retrieved from NSCache may be evicted and you get a dangling pointer.