Hello.
I have an array of custom Foo objects which I would need to display in an
NSTableView object. I implement the data source delegate like this:
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
return [arrayOfFoos count];
}
- (id)tableView:(NSTableView *)tableView
objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger) row {
return [arrayOfFoos objectAtIndex:row];
}
Then I have NSFormatter subclass FooFormatter which takes in a Foo object and
converts it to a string. This formatter object is attached to the formatter
property of the TextFieldCell class in the NSTableView's table column. The
FooFormatter is like this:
@implementation FooFormatter
- (NSString *)stringForObjectValue:(id)anObject {
if ([anObject isKindOfClass:[Foo class]] == NO) {
[NSException raise:NSInvalidArgumentException format:@"Wrong
object"];
}
Foo *foo = (Foo *)anObject;
NSString *string;
// ... convert foo into string ...
return string;
}
@end
I am assuming here that the object returned by the data source
objectValueForTableColumn: is passed to the formatter's stringForObjectValue:
before it is displayed in the text field cell -- this seems not to be the case.
I would like to keep formatting of Foo objects separate from the data source
(if possible) since I intend to implement multiple different FooFormatter
derived classes suited for different situations.
The Cocoa docs seem to be a little low on details on how these NSFormatter
objects are supposed to work. Can anybody give me any insight? Would be
appreciated. Thanks.
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