Key-Value Observing use case?

Question

What are some popular examples of using KVC and KVO? I do not quite understand.

Is this an objective thing C? or cocoa thing? or thing Coca Touch?

Can the iPhone app use KVC KVO?

Thank!

ps I already read the document here: http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html#//apple_ref/doc/uid/10000177i is still puzzled.

Answer 1

, . , , , KVC, KVC ( ). . : http://www.macresearch.org/cocoa_for_scientists_part_xi_the_value_in_keys

KVO , . - . .: http://www.macresearch.org/cocoa_for_scientists_part_xii_observe_and_learn

, Bindings - , , - . : iPhone SDK. Mac OS X, .: http://www.macresearch.org/cocoa_for_scientists_part_xiii_in_a_bind