On Oct 8, 2013, at 1:47 PM, jonat...@mugginsoft.com wrote:

> The NSControl -tag property can be used to identify an action sender.
> 
> Can the NSUserInterfaceItemIdentification protocol property -identifier be 
> safely used for the same purpose?

I don't know, but I'd prefer representedObject for something like that - it'll 
only be used by your code, so you don't have any restrictions to worry about.

> 
> It was introduced to support window restoration.
> 
> The docs apply several caveats with regard to the identifier:
> https://developer.apple.com/library/mac/documentation/cocoa/reference/NSUserInterfaceItemIdentification_Protocol/Introduction/Introduction.html
> 
> From the above:
> 
> You should not change the value of a window’s identifier after adding any 
> views to the window. For views and controls in a window, the value you 
> specify for this string must be unique on a per-window basis.
> 
> The slash (/), backslash (\), or colon (:) characters are reserved and must 
> not be used in your custom identifiers. Similarly, Apple reserves all 
> identifiers beginning with an underscore (_) character. Applications and 
> frameworks should use a consistent prefix for their identifiers to avoid 
> collisions with other frameworks. For a list of prefixes used by the system 
> frameworks, see “OS X Frameworks” in Mac Technology Overview.
> 
> Jonathan
> 


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