Ah. That's the difference. Okay.
Nevertheless, the Apple docs on the matter are unclear at best
(https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html):
"Declarations marked with the dynamic modifier must also be explicitly marked
with the @objc attribute unless the @objc attribute is implicitly added by the
declaration’s context. For information about when the @objcattribute is
implicitly added, see Declaration Attributes in The Swift Programming Language
(Swift 4)."
The referenced doc has a lot of stuff, so it's hard to zero in on the
discussion of implicit-objc, but there's this:
"The compiler implicitly adds the objc attribute to subclasses of any class
defined in Objective-C."
To me, this means that my NSObject-derived class is implicitly @objc, and so
the members within it (the declaration context) shouldn't need @objc as well.
To help me understand better, can you have dynamic without an implicit or
explicit @objc? It seems not, and if not, why isn't it enough for dynamic to
then just imply @objc to the compiler?
Thanks,
Rick
> On Sep 13, 2017, at 17:06 , Hooman Mehr <hoo...@mac.com> wrote:
>
> When you create a new project in Xcode 9, the defaults for compiler settings
> are different. The errors you see are the result of running in full (strict)
> Swift 4.0 mode which has some such breaking changes.
>
>> On Sep 13, 2017, at 3:56 PM, Rick Mann via swift-users
>> <swift-users@swift.org> wrote:
>>
>> I have an iOS app in which I'm factoring out code into a Framework. In Xcode
>> 9 GM (Swift 4), the code builds fine when it's a monolithic app, but some of
>> the files I've pulled into the framework are no longer compiling. One of the
>> errors is:
>>
>> Model.swift:471:14: 'dynamic' var 'dateCreated' must also be '@objc'
>>
>> The class looks like:
>>
>> import Foundation
>>
>> class
>> MPObject : NSObject
>> {
>> ....
>> dynamic var dateCreated : Date?
>> ....
>> }
>>
>> If I add @objc to each dynamic member, it seems to silence the errors, but
>> the @objc should be implicit due to inheriting from NSObject, and as I said,
>> it builds without error as a monolithic app.
>>
>> --
>> Rick Mann
>> rm...@latencyzero.com
>>
>>
>> _______________________________________________
>> swift-users mailing list
>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
>
--
Rick Mann
rm...@latencyzero.com
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