NSFormatter problem: not getting called for the empty string
- by Enchilada
I have created a custom formatter for my (read-only) table column. It looks like this:
- (NSString *)stringForObjectValue:(id)anObject
{
NSAssert([anObject isKindOfClass:[NSString class]] && anObject != nil,
@"invalid object");
if ([anObject isEqualToString:@""])
return @"EMPTY";
else
return [anObject stringByAppendingString:@"++"];
}
Very simple. The corresponding objects are just strings, so it's an string-to-string formatter. All non-empty string objects are returned with @"++" appended to them. Empty string objects should be turned into the @"EMPTY" string.
The @"++" gets appended to non-empty strings just fine.
The problem is, @"EMPTY" never gets shown! My formatter is never called by Cocoa when the underlying object is the empty string. The corresponding row just keeps being empty, instead of showing my requested @"EMPTY".
Any ideas?
