The test app I made contains no code except for the value transformer. The
stuff that is not code is just a Core Data model with one entity called "User",
with two attributes "name" (string) and "lastLogin" (date).
The IB stuff is just one array controller bound to the app delegate's MOC with
mode set to Entity and the entity set to "User" and "Prepare Contents" checkbox
checked. The UI is just a table view with two columns; one column is bound to
the array controller's arrangedObjects.name and the other column is bound to
array controller's arrangedObjects.name. Feel free to type in the "Name" and
"Last Login" headers above the columns just for clarity. Also, there are two
"Add" and "Remove" buttons that are bound to the array controller in the
obvious way.
And finally, there is a text field that is bound to array controller's
selection.lastLogin with a value transformer set to CleanDateTransformer. Here
is the code for CleanDateTransformer:
#import "CleanDateTransformer.h"
@interface CleanDateTransformer ()- (NSDate *)cleanDateFromDate:(NSDate
*)aDate;@end
@implementation CleanDateTransformer
+ (Class)transformedValueClass{ return [NSDate class];}
+ (BOOL)allowsReverseTransformation{ return NO;}
- (id)transformedValue:(id)value{ if (value == nil) return nil; if
(![value isKindOfClass:[NSDate class]]) { NSLog(@"invalid class");
//running the test app shows that this never gets called anyway return nil;
} return [self cleanDateFromDate:value];}
- (NSDate *)cleanDateFromDate:(NSDate *)aDate{ NSDateComponents *components =
[[NSCalendar currentCalendar]
components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit
fromDate:aDate]; NSDate *cleanDate = [[NSCalendar currentCalendar]
dateFromComponents:components]; return cleanDate;}
@end
> > Thanks for the tip. However, the value transformer idea did not
> > work. Even though it ended up showing exactly the same date (the
> > value transformer just strips the time from the date) for each row,
> > selecting multiple rows still leaves us with "Multiple values" in
> > the text field.
>
>
> Might be a good idea to post your code so we know what you tried.
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