I am trying to figure out exactly what is happening here. I have a mutable dictionary where each object is also an NSMutableDictionay containing 9 string objects.
NSMutableDictionary* myData; // this is in MyController object. In a window, I have an NSTableView whose column data is tied to an NSArrayController. The NSArrayController is bound to myData with IB: Bind to MyController, keypath: myda...@allvalues This all works fine, except.... I would expect the following to have the same addresses: NSMutableDictionary* myItemA = [[[MyController myData] allValues] objectAtIndex:0]; NSMutableDictionary* arrayContItemA = [[myArrayController arrangedObjects] objectAtIndex:0]; The content is the same (the 9 strings) so it is coming from the right place, but the addresses of the objects are different so for some reason the NSArrayController is making a copy of my dictionary object somewhere along the line. I understand that the array returned by allValues is not mutable so the NSArrayController may need to make a mutable copy of it, but the internal objects are mutable... So why is it copying my objects? If I add the following just before the above two lines, then the objects have the same address as expected. [MyController willChangeValueForKey:@"myData"]; [MyController didChangeValueForKey:@"myData"]; So I gather this is forcing the NSArrayController to write it's copied/cached values back to myData. The point is that I need to be able to edit the items in the NSTable, then write myData back to disk and have the changes be saved. If I never call will/didChangeValueForKey, then the changes are lost. Since I am not changing myData directly but it is being changed by the NSTableView and NSArrayController, why does this happen this way? Thanks, Trygve _______________________________________________ Cocoa-dev mailing list ([email protected]) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
