Re: Problem with NSSortDescriptor sorting NSMutableArray?
Re: Problem with NSSortDescriptor sorting NSMutableArray?
- Subject: Re: Problem with NSSortDescriptor sorting NSMutableArray?
- From: Ryan Bates <email@hidden>
- Date: Mon, 16 Feb 2004 18:56:52 -0800
On Feb 16, 2004, at 6:24 PM, Peter Dean wrote:
[arrayOfRecords sortedArrayUsingDescriptors:[NSArray
arrayWithObjects:
countryDescriptor,provenceDescriptor,cityDescriptor,nil]];
The "sortedArrayUsingDescriptors:" method returns a new array that is
sorted, it does not sort the called array. Try "sortUsingDescriptors:"
instead.
Ryan
On Feb 16, 2004, at 6:24 PM, Peter Dean wrote:
I have an NSMutableArray which contains an array of objects, of which
is displayed through NSTableView. My desire is to make use of the
NSSortDescriptor for sorting, which I have not been successful is
returning a sorted array - even though I have been successful with the
selector method, the NSSortDescriptor has become a bit of a Nemesis
that I now need to overcome.
I have been trying various snipets of code through books,
mailling-lists, FAQ, sample code, and nearly all refer to the selector
methods, which now brings me to the maillist list forum.
Please find below a snipet of my MyDataSource.m code, it compiles and
when run, it appears to be doing something in when the table header is
clicked upon, but unfortunately doesn't display a sorted list, unlike
utilising the selector method.
- (void)tableView:(NSTableView *)tableView
didClickTableColumn:(NSTableColumn *)tableColumn
{
NSString * identifier = [tableColumn identifier];
if ([identifier isEqualToString:@"country"])
{
// Flip flop the sorting direction
mySortingDirection = !mySortingDirection;
// Set the sorting image
[tableView setIndicatorImage: (mySortingDirection ? [NSImage
imageNamed:@"NSAscendingSortIndicator"] : [NSImage
imageNamed:@"NSDescendingSortIndicator"]) inTableColumn: tableColumn];
// Define to sorting order - haven't been able to get it to work
yet. Only the basic selector method - bugger!!!
NSSortDescriptor * countryDescriptor = [[[NSSortDescriptor alloc]
initWithKey:@"country" ascending:mySortingDirection] autorelease];
NSSortDescriptor * provenceDescriptor = [[[NSSortDescriptor alloc]
initWithKey:@"provence"ascending:mySortingDirection] autorelease];
NSSortDescriptor * cityDescriptor = [[[NSSortDescriptor alloc]
initWithKey:@"city" ascending:mySortingDirection] autorelease];
// Perform the sort
//[arrayOfRecords sortUsingSelector:@selector(customComparison:)];
[arrayOfRecords sortedArrayUsingDescriptors:[NSArray
arrayWithObjects:
countryDescriptor,provenceDescriptor,cityDescriptor,nil]];
// Refresh
[tableView reloadData];
}
}
Look forward to your assistance,
Peter J. Dean
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