Re: Finding the largest value in an NSTreeController?
Re: Finding the largest value in an NSTreeController?
- Subject: Re: Finding the largest value in an NSTreeController?
- From: Jonathan Dann <email@hidden>
- Date: Sat, 31 May 2008 10:57:36 +0100
To get all the nodes in the tree I do a depth-first search (10.5
only). Add the first method in an NSTreeNode category and the second
to a category on NSTreeController.
// NSTreeNode_Extensions
- (NSArray *)descendants;
{
NSMutableArray *array = [NSMutableArray array];
for (NSTreeNode *item in [self childNodes]) {
[array addObject:item];
if (![item isLeaf])
[array addObjectsFromArray:[item descendants]];
}
return [[array copy] autorelease];
}
// NSTreeController_Extensions
- (NSArray *)flattenedNodes;
{
NSMutableArray *array = [NSMutableArray array];
for (NSTreeNode *node in [self rootNodes]) {
[array addObject:node];
if (![[node valueForKey:[self leafKeyPath]] boolValue])
[array addObjectsFromArray:[node valueForKey:@"descendants"]];
}
return [[array copy] autorelease];
}
You then have an NSArray with all of the NSTreeNodes and can just call
[treeNodesArray valueForKey:@"representedObject"] to get you model
objects, and then can do whatever you like. If you're using Core
Data, can't you fetch all your managed objects and determine the one
with the max vaule?
Jon
On 31 May 2008, at 10:35, Rick Mann wrote:
I'd like to find the largest integer value of one of my entity
fields, stored in an NSTreeController. Is this possible? I'm trying
to use "@max", but getting back null on every variant:
NSNumber* maxVal = [mItemsController valueForKeyPath:
@"@max.number"];
I also tried with "arrangedOBjects".
I can't even figure out how to manually iterate the objects. Is
there a way?
TIA,
--
Rick
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden