On Jan 13, 2010, at 8:39 AM, Richard Somers wrote:
> On Jan 13, 2010, at 1:17 AM, Kyle Sluder wrote:
>
>> This code cannot generate that error because it doesn't send any
>> messages. You need to post the code to which the error actually
>> refers.
>
> This works.
>
> @property (nonatomic, retain) NSNumber *selected;
>
> if ([[self selected] boolValue]) { ... }
>
> This produces error "unrecognized selector sent to instance".
>
> @property (nonatomic, retain, getter=isSelected) NSNumber *selected;
>
> if ([[self isSelected] boolValue]) { … }
Assuming you are using @dynamic and relying on Core Data to generate the
accessors for you, that isn’t going to work. Core Data doesn’t support the
isPropertyName getter style.
This style is typically used for non-object BOOL values. If you use it for an
NSNumber attribute, you run the risk of someone familiar with the pattern
assuming it is a BOOL property and writing
if ([managedObject isSelected]) {
}
which will of course be be true whenever the property is non-nil, no regardless
of the actual value.
If you want or need to use custom getters/setters, you’ll have to provide your
own accessors rather than relying on the @dynamic generated ones.
- Jim_______________________________________________
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