On May 4, 2011, at 8:17 AM, glenn andreas wrote:

> On May 4, 2011, at 9:00 AM, Steve Christensen wrote:
> 
>> I'm working on an app that uses a tab bar. I created a new nib to set up a 
>> view+controller and added a new tab item to the main nib that references the 
>> controller and the controller's nib, plus I filled in some basic 
>> functionality in the view controller. Since it's relevant, the controller's 
>> IBOutlets are
>> 
>> IBOutlet MyTableView* _resultsTable;
>> IBOutlet UIActivityIndicatorView* _searchActivityIndicator;
>> IBOutlet UISearchBar* _searchBar;
> 
> First step:  Don't prepend your ivars with underscores.
> 
> From 
> <http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html>,
>  and I quote:
> 
> "     • Avoid the use of the underscore character as a prefix meaning 
> private, especially in methods. Apple reserves the use of this convention. 
> Use by third parties could result in name-space collisions; they might 
> unwittingly override an existing private method with one of their own, with 
> disastrous consequence."
> 
> You may be seeing one of those "disastrous consequences"

I did think about that. I renamed the ivars to something completely different, 
rewired the xib and tried it out with no difference in behavior.

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