How to use NSIndexSet

Question

In Objective-C, my program opens a window and displays a table. I want to have a specified row of the table highlighted.

How do I do this?

I seem to need the code

[myTableView selectRowIndexes:(NSIndexSet *) byExtendingSelection:(BOOL)]; 

I looked at the developer documentation, and figured out that the BOOL should be NO.

By looking at the NSIndexSet docs, I can't figure out what the right syntax should be.

Answer 1

it would be the proper way:

NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 3)]; 

or you can use the NSMutableIndexSet for the random indexes:

NSMutableIndexSet *mutableIndexSet = [[NSMutableIndexSet alloc] init]; [mutableIndexSet addIndex:0]; [mutableIndexSet addIndex:2]; [mutableIndexSet addIndex:9]; 

etc.

Answer 2

Printing out an NSIndexSet in the debugger will show you that they are internally NSRanges. To create one, you can either specify the range or a single explicit index (from which it will create the range); something like

NSIndexSet *indexes = [[NSIndexSet alloc] initWithIndex:rowToHighlight]; [myTableView selectRowIndexes:indexes byExtendingSelection:NO]; [indexes release]; 

Note that the index(es) must all be unsigned integers (NSUIntegers, specifically).