Re: Memory management with nibs

FROM : Julien Palmas
DATE : Fri Apr 22 02:26:44 2005

Well, let me clarify a bit what I said before.
There is only ONE type of document I open. That is to say, all the 
documents have the same file extension.

BUT, those documents can contain a wide variety of different 
information. And one document is not bound to contain this kind or this 
kind of information ...

Hence, I created a sub class of NSDocument containing the common nib 
and information for each document. Those nibs are correctly released 
when closing a document.
But I also have other nibs, one for each different piece of information 
present in the document. Let's say there are 50 different nibs, being 
able to load only 2 of them if necessary is much more efficient that 
always loading the 50 !!!

My question is about the file owner for those nibs. What class (sub 
class) should I use. I don't want to make the NSDocument the file 
owner. And what should I do to make sure those nibs are correctly 
released once the document closed?

On Apr 21, 2005, at 8:49 PM, Dirk van Oosterbosch wrote:

> Hi Julien,
>
> AFAIK the standard way to deal with multiple types of documents and 
> multiple different UI's is to make multiple different subclasses of 
> NSDocument.
> These then are set in the corresponding nib to be the File's Owner, 
> you override - (NSString *)windowNibName to return the appropriate 
> nibname and you change the NSDocumentClass keys in your Info.plist so 
> the NSDocumentController knows which NSDocument subclass to use to 
> open your files with.
>
> or review the documentation again
> http://developer.apple.com/documentation/Cocoa/Conceptual/Documents/
> index.html?http://developer.apple.com/documentation/Cocoa/Conceptual/
> Documents/Tasks/SubclassNSDocument.html
>
>
> I believe then everything is managed for you and you don't have to 
> concern about releasing of the nib's
>
> HTH
>
> Best,
> dirk
>
>
> On 21-apr-05, at 11:05, Julien Palmas wrote:
>

>> I have a document based app with only one window per document.
>>
>> This application can open a large variety of different documents, so 
>> I decided to create several nib files, each containing the 
>> corresponding view for the document.
>>
>> When opening the document, I check its kind and load the according 
>> nib. This helps reduce the application footprint and the load time, 
>> as I don't open all the nibs ...
>>
>> Still, This is my first document based app and I have issues about 
>> the files owner. For each different nib, I created a subclass of 
>> NSObject and set it as the file owner when I load the nib with 
>> [NSBundle loadNibNamed:] This owner has several IBOultets, but not 
>> for every single element in the nib.
>>
>> The thing is that when I release the owner, I don't think the nib is 
>> released as well, as my nib owner is not a sub-class of 
>> NSWindowController. But as I only have one window (that already has 
>> its NSWindowController), I didn't wanted to use a sub-class of 
>> NSWindowController for the nib owner.
>>
>> How could I do to make sure my nib is released ?
>>
>> Some "good-coding" advices would be greatly appreciated.
>>
>> Julien
>>
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