Re: Circular initialization of controllers in NIB file

FROM : Jonathan Hess
DATE : Thu Jan 03 22:28:54 2008

Hey Nathan?

Outlet cycles are legal and supported. When are you expecting to see a 
value for the instance variable and finding it to be nil? Are you 
checking during one of your init methods? During one of your setters? 
In the awakeFromNib method? The outlets of your objects won't be 
established until just before awakeFromNib is invoked on your object.

Jon Hess

On Jan 3, 2008, at 11:00 AM, Nathan Auch wrote:

> Alastair Houghton wrote:

>> On 3 Jan 2008, at 18:16, Nathan Auch wrote:
>>

>>> Thus, the main window controller has an IBOutlet for a panel 
>>> controller, and the panel controller has an IBOutlet for the main 
>>> window controller. These are both assigned in Interface Builder. 
>>> After loading the NIB file, the IBOutlet pointing to the main 
>>> window controller from the panel controller is never set (value is 
>>> nil). I think this must be because there is a circular dependency 
>>> during initialization of the NIB file.

>>
>> No, that's not the problem.  Most likely you have chosen a name for 
>> your variable for which there is an unrelated -setSomeName: method; 
>> that method will be being called during initialisation, rather than 
>> just setting the variable directly.

>
> This doesn't appear to be the case, the name of the variable was
> "main_controller", I've changed it to "my_main_controller" and
> reconnected the outlets in IB but I'm still seeing the same behaviour.
> In general, are there any best practices for choosing variable names 
> to
> avoid the situation you describe?
>
> What's the best way to go about debugging issues with NIB file 
> loading?
> Can I break on something specific in the debugger? In the mean time,
> I'll see if I can get a small repro together, and post the code to 
> this
> list.

>>
>> Kind regards,
>>
>> Alastair.
>>
>> --
>> http://alastairs-place.net
>>
>>
>>
>>
>>

>
>
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