Why does cocoa use delegates rather than inheritance?
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With delegates, you can have one object be the delegate of many other objects. For example, you can have your MyController instance be the delegate of an NSTableView, an NSTextField, an NSWindow, and any other objects that compose your interface. This gives a compact place to put all of your user interface code related to one section of your UI.
If you’d done that with subclassing, you’d have to create one subclass every object you wanted callbacks from.
Also, this is a classic inheritance vs composition question