CODEWITHSUNDEEP
macoscocoanstableviewcocoa-bindingsnstablecolumn
Daniel Farrell
Daniel Farrell

Reputation: 9770

How can I bind to NSTableColumn's headerTitle?

I would like to bind NSTableColumn's headerTitle property to an NSMutableArray in my model layer (via an NSArrayController).

Basically I want to have an array where I can change values and have the table column header titles update. Is that reasonable?

However, the headerTitle binding wants an single NSString and I'm not sure how to connect my model object to this binding via my NSArrayController. Google does not give many hits for this problem.

My model layer consists of two class (both of which are appropriately KVC compliant). The first is a model which represents a single column title, it has one property title,

// A model class representing the column title of single NSTableColumn
@interface ColumnTitle : NSObject
@property NSString *title;
+ (ColumnTitle*) columnTitleWithTitle:(NSString*) aString;
@end

The second a model object which represents an ordered group of ColumnTitle objects,

// Class representing an order collection of model items
@interface TableColumnTitles : NSObject
@property NSMutableArray* columnTitles;  // an array of ColumnTitle objects
// These are the KVC array accessors
-(void) insertObject:(ColumnTitle*)columnTitle inColumnTitlesAtIndex:(NSUInteger)index;
- (void)removeObjectFromColumnTitlesAtIndex:(NSUInteger)index;
- (void)replaceObjectInColumnTitlesAtIndex:(NSUInteger)index withObject:(ColumnTitle*)columnTitle;
@end

Note that TableColumnTitles object implements the above array accessors which are required for the bindings. Any suggestions?

Upvotes: 2

Views: 145

Answers (2)

Jay
Jay

Reputation: 6638

Haven't tried that before but what you're actually asking for is using KVC for array indexes. A quick google didn't turn up anything on that issue except some results that indicate it's not (yet) possible (check this)

The easiest work-around I could come up with would be to simply add dedicated properties for the array indexes.. not nice but does the job.

So for a NSMutableArray called myArray and contains objects with title properties of type NSString you'd do something like:

@property (nonatomic, readonly, getter = columnOneGetter) NSString *columnOneString;

(NSString*) columnOneGetter
{
   return myArray[0].title;
}

Always assuming of course their number is known in advance and we're not talking 200 columns :-)

Upvotes: 1

Jonathon Hibbard
Jonathon Hibbard

Reputation: 1546

I think this may/may not be what you're after, but quick google search landed me here: http://pinkstone.co.uk/how-to-add-touch-events-to-a-uitableviewfooter-or-header/

edit: i realize this is for mac (not ios) but should be pretty easy to translate if it actually helps.

Upvotes: 0

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