On Sep 4, 2013, at 4:13 AM, cocoa-dev-requ...@lists.apple.com wrote:
> Date: Wed, 04 Sep 2013 10:23:04 +0100
> From: Dave <d...@looktowindward.com>
> Subject: Subclassing a View Controller in a Storyboard
>
> Hi All,
>
> If I am using a Storyboard that contains a view controller,
> LTWMusicViewController that I'd like to sub-class like so:
>
> LTWRockMusicViewController : LTWMusicViewController
>
> Then in the viewDidLoad method, do:
>
> -(void) viewDidLoad
> {
> [super viewDidLoad];
>
> self.pMusicCategory = kRockMusicCategory;
> }
>
>
> ----------------------------
>
> At present LTWMusicViewController is loaded using:
>
> myViewController = [self.storyboard
> instantiateViewController:@"LTWMusicViewController"];
>
>
> I want LTWRockMusicViewController to use same NIB etc, as
> LTWMusicViewController, but just pre-set the self.pMusicCategory property to
> Rock.
>
> How do I do this using a Storyboard? I don't really want to copy all the
> controls for LTWMusicViewController into LTWMusicViewController.
What you're doing has a lot of bad smells:
* If I'm only going to call instantiateViewController, why am I using a
storyboard here at all? If I use a .xib file instead, I can tell the view
controller what .xib to use at its view nib, regardless of it's class.
* If the only difference between this object and that one is
self.pMusicCategory, why am I bothering to subclass? Why not set the music
category of the instance as soon as it is created? Gosh, if I weren't using a
storyboard, I could even have a designated initializer that takes a music
category as a parameter.
* Even if you must use a storyboard, you can set an arbitrary variable in the
resulting instance, using the user-defined runtime attributes.
* If all else fails, implement loadView. Now finding the view is up to you. You
can keep the view in a .xib file even if you are getting the view controller
from a storyboard (delete the view controller's view from the storyboard to
indicate that you will supply it in some other way).
m.
--
matt neuburg, phd = m...@tidbits.com, http://www.apeth.net/matt/
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