Deprecated APIs, as you may know, are methods or classes that are outdated and will eventually be removed. Apple deprecates APIs when they introduce a superior replacement, usually because they want to take advantage of new hardware, OS or language features (e.g. blocks) that were't around when the original API was conceived. Whenever Apple adds new methods, they suffix the method declarations with a special macro that makes it clear which versions of iOS support them. For example, for UIViewController, Apple added a new way to present modal controllers that uses a block callback. The method declaration looks like this:


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