Aspects
Delightful, simple library for aspect oriented programming by @steipete.
Think of Aspects as method swizzling on steroids. It allows you to add code to existing methods per class or per instance, whilst thinking of the insertion point e.g. before/instead/after. Aspects automatically deals with calling super and is easier to use than regular method swizzling.
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An important limitation is that for class-based hooking, a method can only be hooked once within the subclass hierarchy.
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KVO works if observers are created after your calls
aspect_hookSelector:It most likely will crash the other way around.
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Wow, I remember being very intrigued by AspectCocoa 10 years ago (http://cocoadev.com/AspectCocoa), it's fun to see the concepts finally used in actual real apps.
