I am throwing it myself (or more exactly a c++ library I call within a
get method of the model class). But I don't want to handle the
exception in the model class, but rather in the controller, which can
then disable some UI buttons.
Am 17.09.2009 um 16:41 schrieb Sean McBride:
On 9/17/09 1:26 PM, Konrad Windszus said:
I have a classical binding usecase: A NSArrayController is used for
displaying the columns of a NSTableView. The columns itself therefore
use the arrangedObject method of the NSArrayController. In the get
methods of the model itself (which normally return an NSString* which
should be displayed in the column), there could occur an exception. I
want to catch that exception in the NSArrayController. I therefore
subclassed the NSArrayController and overwrote valueForKeyPath with a
simple:
- (id)valueForKeyPath:(NSString *)keyPath {
try {
[super valueForKeyPath:keyPath];
}
catch (...) {
// want to get here, if there is an exception thrown within the
model class
}
}
Unfortunately it is only called with arrangedObjects. At that point
no
exception is thrown yet. Somewhere after that a valueForKeyPath must
be executed on that returned arrangedObjects. Since I have not
subclassed this proxy class, I cannot intercept its valueForKeyPath
method and therefore cannot catch the exception. Is there a simple
way
to catch exceptions in the controller class which is thrown during
calling a get method (over binding mechanims)?
What's this exception you speak of? Are you throwing or is the
system?
--
____________________________________________________________
Sean McBride, B. Eng [email protected]
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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