Re: IB Palettes?

FROM : Jon Hess
DATE : Fri Nov 23 08:05:08 2007

On Nov 22, 2007, at 1:32 PM, Rick Mann <<email_removed>> wrote:

>
> On Nov 22, 2007, at 1:16 PM, Jonathan Hess wrote:
>

>> In Interface Builder you can specify that any instance can be of a 
>> different more derived type at runtime. To do this use the identity 
>> inspector (command + 6) and use the custom class combo box to type 
>> in a new class name. At runtime, an instance of that class will be 
>> instantiated in place of the selected object.
>>
>> So, if you subclassed NSView, drag an NSCustomView to your 
>> document. If you subclassed something more specific like an 
>> NSButton, drag an NSButton to your document. Once you've done that 
>> select the instance and use the identity inspector to change the 
>> class to your custom subclass. When you load your nib at runtime an 
>> instance of your custom class will be instantiated instead of the 
>> button.

>
> Thanks.
>
> So, that's the second technique described by "View Programming Guide 
> for Cocoa." It says:
>

>> The second technique is to specify a custom class is used when your 
>> custom view subclass inherits
>> from a view that Interface Builder provides support for directly. 
>> For example, you can create an
>> NSScrollView instance in Interface Builder and specify that a 
>> custom subclass (MyScrollView) should
>> be used instead, again using the inspector. In this case, when the 
>> nib file is loaded by the application,
>> the view instance has already been created and the MyScrollView 
>> implementation of initWithFrame:
>> is never called. The MyScrollView instance receives an awakeFromNib 
>> message and can configure
>> itself accordingly.

>
> The problem here is that, I don't see how my initWithFrame: could 
> ever get called. IB needs to call that before archiving the view, 
> and it doesn't have the ability to call it.
>
> Even if I had a custom palette for it, I don't see how it could call 
> it, but the phrase "If you have not created an Interface Builder 
> palette" implies that there is a way to create a palette.
>


Hey Rick -

Your view will get the initWithCoder: message when it has been 
integrated into a document by means of a plugin.  It will also get the 
initWithCoder: message if you use the custom class inspector method 
with anything other than NSCustomView. If you use NSCustomView you'll 
get initEithFrame:.

From my iPhone -
Jon Hess

> --
> Rick
>