Subject: Re: Is "-init" really needed?




> On Aug 7, 2017, at 5:02 PM, David Hoerl <[email protected]> wrote:
>
> But then I though - heck, if Foo has NSObject as its super class, gee, maybe
> -init isn't really need. I mean, if all of Foo's ivars and properties are
> initialized, its a shortcut, right.

-[NSObject init] happens to be a no-op empty method. So if a direct subclass of
NSObject has no -init method of its own, you could get by with just calling
+alloc. However, I think this would be a really bad idea. If at some point you
needed to add an -init method to class Foo, like to initialize an ivar, you’d
have to go and fix all this code that wasn’t calling -init, or else you’d
suddenly have a number of bugs in your code. Even worse, if someone else added
the -init method and didn’t know about this quirk of how callers initialized
Foo, they might have no idea why their method didn’t get called. Yuck.

—Jens
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