Just for clarification, an empty name in the parens is referred to as an extension and not a nameless category. An extension has extra abilities such as adding properties. Just being explicit for those that may not know.
Please excuse mobile typos > On Mar 29, 2019, at 5:55 PM, Jens Alfke <j...@mooseyard.com> wrote: > > > >> On Mar 29, 2019, at 2:51 PM, Alex Zavatone <z...@mac.com> wrote: >> >> Also, I seem to remember the esteemed Jens stating that as soon as a >> category class is in your project, it applies to all objects instantiated >> from the base class and we only had to do an import if we wanted to use the >> category methods in the debugger. Please correct me if I am wrong here. > > No, you have to #import the header if you want to use the category methods in > a source file. > > At _compile_ time, when you call one of those methods the compiler needs to > have seen a prior declaration of that method or it'll flag an error. Thus, > you need to have #included the header file declaring the category. (The > compiler _could_ go ahead and decide you know what's right, and just compile > a call to that method anyway; back in the old days it used to, but that > turned out to lead to lots of stupid runtime crashes caused by mistyped > method names.) > > At _runtime_, the category patches the class implementation when your app > starts, so its methods are available everywhere. > > —Jens > _______________________________________________ > > 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: > https://lists.apple.com/mailman/options/cocoa-dev/cody%40servalsoft.com > > This email sent to c...@servalsoft.com _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
