Why did I prefix the key of an NSSortDescriptor with "@"?
Why did I prefix the key of an NSSortDescriptor with "@"?
- Subject: Why did I prefix the key of an NSSortDescriptor with "@"?
- From: Jerry Krinock <email@hidden>
- Date: Tue, 25 Jul 2006 12:51:12 -0700
- Thread-topic: Why did I prefix the key of an NSSortDescriptor with "@"?
I'm trying to re-use some code I wrote a few months ago for
tableView:didClickTableColumn. This method sorts the clicked column and
flips the up/down triangle.
I notice that, for some reason which I cannot remember but vaguely recall
activated some semi-secret feature, I prefixed the character "@" onto the
tableColumn's identifier (string) before passing it as the key to to
NSSortDescriptor's initWithKey:ascending method.
I cannot find any notes or any mention of that "@" in searching
documentation today. Am I imagining things?
Jerry Krinock
- (void)tableView:(NSTableView *)tableView
didClickTableColumn:(NSTableColumn *)tableColumn {
//*** Here is where I add the prefix:****************
NSString* key = [NSString stringWithFormat:@"@%@",
[tableColumn identifier]] ;
BOOL ascending ;
NSImage* currentImage =
[tableView indicatorImageInTableColumn:tableColumn] ;
if (currentImage == [NSImage imageNamed:@"NSAscendingSortIndicator"]) {
[tableView setIndicatorImage:[NSImage
imageNamed:@"NSDescendingSortIndicator"]
inTableColumn:tableColumn] ;
ascending = NO ;
} else {
[tableView setIndicatorImage:[NSImage
imageNamed:@"NSAscendingSortIndicator"]
inTableColumn:tableColumn] ;
ascending = YES ;
}
//*** Here is where I use it: ***************
NSSortDescriptor* descriptor = [[NSSortDescriptor alloc]
initWithKey:key ascending:ascending] ;
NSArray* descriptors = [NSArray arrayWithObject:descriptor] ;
NSArrayController* arrayController = [self arrayController] ;
[arrayController setSortDescriptors:descriptors] ;
[table reloadData] ;
[table selectRowIndexes:[arrayController
selectionIndexes] byExtendingSelection:NO] ;
[descriptor release] ;
}
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