On Tue, Sep 20, 2011 at 3:15 PM, Graham Cox <[email protected]> wrote:
> I could of course assign the save panels to an ivar of the delegate so that
> it can perform a comparison, but that strikes me as pretty messy, given that
> otherwise the panels are very neatly encapsulated along with their completion
> blocks. In addition, the delegate class is already complex and broken up into
> multiple categories for ease of managing the code, and this code lives in a
> category. Adding an ivar would need to be done in the main class interface
> file and when you do that to support functionality in a category, you get a
> warning from the analyser that the ivar is 'unused'.
Delegates often own the things that delegate to them. There's nothing
messy about this:
NSSavePanel *savePanel = [NSSavePanel savePanel];
MySavePanelDelegate *delegate = [[MySavePanelDelegate alloc] init];
[savePanel setDelegate:delegate]; // savePanel doesn't retain delegate
[delegate setSavePanel:savePanel]; // delegate retains savePanel
[savePanel beginWithCompletionHandler:^(NSInteger result){ /* ... */ }];
But perhaps an even better idea would be to factor out more of the
save-panel logic into that delegate object.
--Kyle Sluder
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