Re: ArrayController vs Pop-up button vs Transformer -- three way tag team death match!
Re: ArrayController vs Pop-up button vs Transformer -- three way tag team death match!
- Subject: Re: ArrayController vs Pop-up button vs Transformer -- three way tag team death match!
- From: Ben Golding <email@hidden>
- Date: Wed, 20 Apr 2011 23:20:57 +1000
On 20/04/2011, at 19:07, Joanna Carter wrote:
>> Your value transformer, if you insist on doing it that way, should be coded to expect this, and should transform an entire array of strings, not single strings.
>
> I got the impression that the array in question could hold unprintable characters (tab, etc) and that the transformer was to make them into human-readable strings (@"TAB"). There is certainly no problem with displaying lists of strings via the Content binding, whether it is through an array controller or not.
>
> But, you reckon that the transformer for the binding has to transform the whole array? Hmmm, now I'm going to have to try that out :-)
I tried it out and returning the whole array from the transformer made the pop-up button look as I wanted it! Thanks everyone, I thought it was a team effort here -- nice work. Note that I used:
popupButton.contentValues -(Transformer)-> [arrayController].arrangedObjects
That said, I do think it's inconsistent with the way that I expected the pop-up button bindings to work. I'll put together a simple example and send it to bugreporter.
The code I wound up using in the transformer looks like:
- (NSString *)transformString:(NSString *)value
{
return ([value length] == 1) ? [NSString stringWithFormat:@"%C (x)", [value characterAtIndex:0], [value characterAtIndex:0]] : value;
}
- (id)transformedValue:(id)value
{
if ([value respondsToSelector:@selector(characterAtIndex:)])
return [self transformString:value];
else if ([value respondsToSelector:@selector(objectAtIndex:)]) {
NSMutableArray *a = [NSMutableArray array];
for (id v in value)
[a addObject:[self transformString:v]];
return [NSArray arrayWithArray:a];
} else
return value;
}
I figure if the way this is handled changes at some stage, the code should continue to work.
Thanks again.
Ben.Attachment:
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