On Apr 12, 2013, at 9:30 AM, Roland King <r...@rols.org> wrote:

> Did you have a particular use-case in mind?

I am using the modalVC to set/change parameters for a calculation.  These 
parameters are properties of the presentingVC, which also has a 'Start 
Calculation' button.  So when I open the modalVC, the textfields need to show 
the current values of the parameters. When I close it, the values need to go 
back to the properties of the presentingVC.  So using the completion block to 
pass these values around seemed like a good idea.

- Koen.
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