Hi Roland,
I think you’re right. The trick is - what do I put in the Storyboard such that
it sticks (and IB doesn’t just change it back) and resolves at runtime?
-Stevo Brock
Owner
Sunset Magicwerks, LLC
www.sunsetmagicwerks.com
@SunsetMagicwrks
818-478-9758
> On Dec 3, 2015, at 11:17 PM, Roland King <r...@rols.org> wrote:
>
>
>> On 4 Dec 2015, at 14:45, Stevo Brock <devli...@sunsetmagicwerks.com> wrote:
>>
>> I’m trying to set up a UIViewController than can host a number of different
>> UIViews as long as they adhere to a given protocol. I’ve worked through
>> getting things set up to make the compiler happy, but I’m getting a runtime
>> error loading the view controller from the storyboard. Below is the
>> relevant code.
>>
>> How do I specify the class in the storyboard so it will load correctly? Or
>> perhaps there’s a different way to construct this all so it will work?
>>
>> protocol MediaItemView {
>> }
>>
>> class PhotoMediaItemView : UIImageView, MediaItemView {
>> }
>>
>> class VideoMediaItemView : VideoPlayerView, MediaItemView {
>> }
>>
>> class MediaItemViewController<T where T: UIView, T: MediaItemView> :
>> UIViewController {
>> private var currentMediaItemView :T?
>> }
>>
>>
>> let mediaItemViewController =
>>
>> self.storyboard?.instantiateViewControllerWithIdentifier("MediaItemViewController")
>> as!
>> MediaItemViewController<VideoMediaItemView>
>>
>> Storyboard has a view controller with the Class set to
>> "MediaItemViewController"
>>
>> 2015-12-03 22:07:23.966 Media Tools[14143:276368] Unknown class
>> _TtC11Media_Tools23MediaItemViewController in Interface Builder file.
>> Could not cast value of type 'UIViewController' (0x10d1dfd60) to
>> 'Media_Tools.MediaItemViewController<Media_Tools.PhotoMediaItemView>'
>> (0x1193fc038).
>
> I don’t see how that would work. IB needs a fully specified class in order to
> instantiate it, you just have the name of the generic. At the least you need
> MediaItemViewController<VideoMediaItemView> but I’m not even sure that would
> work. The error message is indeed telling you that no such class as
> MediaItemViewController exists, because it doesn’t, only specialised versions
> of it actually exist (you can probably dump your binary to see what they are
> called, I don’t know the mangled naming convention for generics)
>
>
>
>
_______________________________________________
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
