There are 3 ways to add ivars to a class. The traditional way:
@interface Foo {
id _bar;
}
And 2 new ways:
@interface Foo() { // Class extension, note the ()
id _baz;
}
@implementation Foo { // Implementation block.
id _faz;
}
> On Jun 3, 2015, at 7:32 AM, Alex Zavatone <z...@mac.com> wrote:
>
> Maybe I should have included the text above it.
>
> "It's also possible to use a class extension to add custom instance
> variables. These are declared inside braces in the class extension interface."
>
> So, I don't know how you see that it goes in the @implementation block since
> the code I pasted and the line above it say it goes in the @interface.
>
> Page 73 of
> https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/ProgrammingWithObjectiveC.pdf
>
> On Jun 3, 2015, at 10:22 AM, Mark Wright wrote:
>
>> That’s a ‘Class Extension’. Furthermore, it’s under the title "Class
>> Extensions Extend the Internal Implementation”. It also mentions that it
>> goes in the @implementation block…
>>
>>
>>
>>
>>> On 03 Jun 2015, at 15:11, Alex Zavatone <z...@mac.com> wrote:
>>>
>>> Apple's Programming with Objective-C reference document © 2014
>>>
>>> https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/ProgrammingWithObjectiveC.pdf
>>>
>>>
>>> Page 73
>>>
>>> @interface XYZPerson () {
>>> id _someCustomInstanceVariable;
>>> }
>>> ...
>>> @end
>>>
>>> Uhhhhhh.
>>>
>>> Doesn't this violate Clang's own mention that "declaration of instance
>>> variables in the interface is deprecated" in Apple's own recommendations
>>> and documentation?
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>>
>
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--
David Duncan
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