Le 20 nov. 2009 à 21:09, Michael de Haan a écrit : >> >> >> The usual way is to NOT implements the NSObject category and test if the >> delegate implements the method using -respondsToSelector: >> But this way works too if you don't want to have to test before sending your >> message. >> >> Anyway, informal protocols are "deprecated" in favor of @protocol with >> @optional method. >> >> >> -- Jean-Daniel >> >> >> >> > > > Did not see that it was deprecated, but will take your lead and convert them > to that. Does the, in your opinion, "optional" addition pretty much replace > categories as a whole, or is there still a role for them? >
They are not formally deprecated (that's why I used quotes), but Apple replaced most if not all Cocoa informal protocols in 10.6 and there is no reason to use them anymore. @optional replaces categories used as informal protocol, but this is not the only usage for categories. They are very useful if you want to add a method to an existing class. -- Jean-Daniel _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
