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)?
Thanks for any help.
Konrad
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