Okay, thanks. It seems to work if I just typecast it to NSString *,
since the values are coming from an NSTextField as [textField
stringValue] in my AppController.m when the action is triggered from
the "Add" buttton.
On Jun 22, 2008, at 11:13 AM, Jeff LaMarche wrote:
On Jun 22, 2008, at 12:02 PM, William Squires wrote:
okay, looking up tableView:setObjectValue:forTableColumn:row shows
that setObjectValue: takes an (id), but what is it really? An
NSString pointer? I want to get an NSString that represents the
new value the user typed in for the selected (and edited) cell in
the NSTableView. Can I safely typecast this to (NSString *)? In
which case, maybe the docs should say that this is an (NSString *)
instead of (id)?
The documentation is correct. The Table View Programming Guide states:
The NSTableView object treats objects provided by its data source
as values to be displayed in NSCell objects. If these objects
aren’t of common value classes—such as NSString, NSNumber, and so on
—you may need to create a custom NSFormatter object to display
them. For more information, see Data Formatting Programming Guide
for Cocoa.
In other words, it's not always going to be an NSString *. Whatever
the object is, it will be converted to a string for display, but
the table view is actually capable of holding different types of
data and doesn't change the type that it's holding, so you can't
assume that the object it holds is a string. Now, if you are giving
the table strings, then by all means, cast the object to an
NSString. If you're not sure what the type of object you're getting
back is, you can find out in the debugger console by typing
po [returnedValue class]
or adding an NSLog statement to your code like
NSLog(@"returned value class: %@", [returnedValue class]);
HTH
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