delegates - Notification Center vs. Delegation in iOS SDK -


why did apple choose use delegation communication amongst sdk objects , post notifications notification center others?

in particular, i'm thinking set of keyboard appearance notifications come uiwindow.

is because notification center system means more 1 object can use keyboard appearance action trigger change state, whereas 1 object have been able act delegate implementation?

delegation allows execute methods (and pass parameters) 1 class another. allows method fired when class not imported. delegation allows multiple view controllers (or otherwise classes) fire methods in single view controller.

notification center, on other hand, listens , waits until hears message waiting for. allows multiple listeners in multiple view controllers wait , listen given message.

you delegation 1/many 1 relationship while notification center 1/many 1/many relationship.


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