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Alex Rivera
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I want to have multiple observers on multiple events of a single object (1-to-N relationship). A mechanism to achieve this task is provided by the NSNotificationCenter . The mechanism looks pretty overkill when used for my problem. How I would do it manually without the use of NSNotificationCenter : - (void)addDelegate:(id<DelegateProtocol>)delegate; - (void)removeDelegate:(id<DelegateProtocol>)delegate; to add and remove observers from my object. - (void)someEventFired:(NSObject<NSCopying> *)eventData { for (id delegate in delegates) { NSObject *data = [eventData copy]; [delegate someEventFired:data]; } } This mechanism is straight-forward and simple to implement without the objects having to share additional strings. Is there an official pattern for 1-to-N delegates (like C# events) in an iOS framework besides the NSNotificationCenter ? When should the NSNotificationCenter be used and when not? When should an implementation like the one I am suggesting here be used and when not?
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