Okay, clearly I'm still missing something. Let's say I have a model object:
@interface SMPLPlayer : NSObject
...
@property (nonatomic, assign) NSUInteger pcLevel;
...
@end
and now I also have an NSWindowController subclass:
@interface SMPLRollPCWindowController : NSWindowController
...
@property (nonatomic, weak) SMPLPlayer *thePC;
@property (weak) IBOutlet NSTextField *playerLevelLabel; // <- Inserted by
IB/Xcode
...
@end
I'm leaving off the majority of the "stuff" for simplicity here. In my
SMPLRollPCWindowController.xib, I have a window with a label (that I tied to
the above IBOutlet property in my window controller, via its File's Owner.) Now
I want to bind the "value" of the label (an NSTextField) to the player object's
pcLevel property. Unfortunately, I can't simply put in:
Bind to: File's Owner
Model Key Path: self.thePC.pcLevel
because the "value" of the NSTextField is an NSString, while the player
object's pcLevel property is an NSUInteger. I get a red octagon (in the Model
Key Path field) if I try. Is this what value transformers are for? Or do I need
an NSNumberFormatter on the NSTextField first?
Along the same vein, if I implement my setter for pcLevel as:
-(void)setPcLevel:(NSUInteger)value
{
if (value >= 1)
{
self.pcLevel = value;
}
else
{
// Does anything go here?
}
}
and now, instead of a label, I use a TextField (i.e. the editable one) instead
of the Label, what do I need to do to make sure the user can't type in invalid
values for the pcLevel in the TextField (i.e. field-level validation), where
the model "knows" what valid values are for the field? That is, is there some
way to code the "else" branch above so the controller object can mediate this
transfer-of-knowledge between the model and the view, without having to
hard-code an NSNumberFormatter or some such into the view (which would
introduce unwanted coupling)?
TIA! :)
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