iOS/iPhone/iPad/MacOSX プログラミング, Objective-C, Cocoaなど 以下、READMEより転載。 What's In The Box Performing blocks on an NSObject. Key-value observation () with block handlers. Associated objects in an Obj-C API. (Not directly block-related.) NSArray, NSSet, NSDictionary, and NSIndexSet filtering and enumeration. Macros for more quickly typing out the above. NSInvocation creation using a block. NSTimer block