Hi
I am extending a library class which is also one of my application's
model objects. The Library class contains an NSMutableArray of NSData
which it absolutely needs to perform its tasks. To extend the class i
must now also hold metadata about each NSData object in the array
(i.e. the <item> elements in the array now becomes a pair or triple).
Conveniently the Hillegass example is similar. In RaisMan the person
data is displayed in columns of TableView. (and i would like to have a
tableview maybe also but thats not the point). I should create a new
object called person.h that defines each element in the array and
provides the accessor methods for binding to person.expectedRaise and
person.Name. Then an NSArrayController can give an array for each
column of the data. Another common method is to make an NSMutableArray
of NSMutableDictionaries and then binding the dictionary @"key" to the
arrayController. Either way achieves such a goal.
But here is the crux of my problem:
The library object (which encloses these array) must keep its
interface which is a flat array of NSData (and as originally) is used
on the api side.
Can i store internally the complicated array including the metadata
and use an NSArrayController to expose only the original NSData part
of each item?
In other words;
This would be equivalent to saying that person.Name == persons.person
and person.expectedRaise is a calculated metadata about the person. If
i wanted to use an array of persons in a payroll department object
then i would initialise the department with an array of person names,
and the payroll department would take care of figuring out what the
expectedRaise should be for each person. Then the payroll department
would need to have itself an NSArrayController to map an array of
string objects taken by the initializer to the internal array of
person objects.
Is anything special required to use the NSArrayController
programmatically as i shall not be using Interface Builder?
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