After reading a host of theoretical explanations on bindings, I tried
the bindings-based currency converter tutorial to try to get some
basic feel for bindings in practice. The example is written for an
earlier version of OSX, but I think I reproduced it correctly for
XCode 3. However, I get the following runtime error.
Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'Cannot create number from
object <_NSControllerObjectProxy: 0x148070> of class
_NSControllerObjectProxy'
I am surprised by the error because bindings is supposed to be "smart
enough" to convert the numbers in text fields (strings) to numbers
when necessary. For those who haven't seen the tutorial, the interface
is:
@interface Converter : NSObject
{
double dollarsToConvert;
double exchangeRate;
}
-(double) amountInOtherCurrency;
// implemented as return (double) (dollarsToConvert * exchangeRate)
@end
I have no idea what this error means and found no helpful references
on the web. If someone could shed some light on this issue I'd really
appreciate it. Thanks.
Daniel
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