setting Array in model-class from NSArrayController - macos

Question

How do I set the array in my model-class ValueItem with the content of an NSArrayControllerin my AppDelegate class:
#interface AppDelegate : NSObject <NSApplicationDelegate>
{
ValueItem *vi;
}
and:
#implementation AppDelegate
{
ValueItem *array = [[ValueItem alloc]init];
[array setValueArray:[outArrayController arrangedObjects]];
NSArray *testArray2 = vi.valueArray; // !!!getter or setter doesn't work!!!
NSLog(#"test array 2 is:%#", testArray2);
}
NSLog returns NULL. What do I miss here?
(valueArray is initialized with #property and #synthesize)
ValueItem.h:
#import <Foundation/Foundation.h>
#interface ValueItem : NSObject
{
NSNumber *nomValue;
NSNumber *tolerancePlus;
NSNumber *toleranceMinus;
NSMutableArray *valueArray;
}
#property (readwrite, copy) NSNumber *nomValue;
#property (readwrite, copy) NSNumber *tolerancePlus;
#property (readwrite, copy) NSNumber *toleranceMinus;
#property (nonatomic, retain) NSMutableArray *valueArray;
#end
ValueItem.m:
#import "ValueItem.h"
#implementation ValueItem
#synthesize nomValue, tolerancePlus, toleranceMinus;
#synthesize valueArray;
-(NSString*)description
{
return [NSString stringWithFormat:#"nomValue is: %# | tolerancePlus is: %# | toleranceMinus is: %#", nomValue, tolerancePlus, toleranceMinus];
}
#end

Answer 1

Solution: Need to make sure you're dealing with the AppDelegate's vi property:
// We need to make sure we're manipulating the AppDelegate's vi property!
self.vi = [[ValueItem alloc]init];
[vi setValueArray:[outArrayController arrangedObjects]];
NSArray *testArray2 = vi.valueArray; // !!!getter or setter doesn't work!!!
NSLog(#"test array 2 is:%#", testArray2);
Explanation :
On the first two lines you were manipulating the array ValueItem variable, then attempting to set testArray2 to the value of the uninitialized vi ValueItem variable.
// This is a new variable, unrelated to AppDelegate.vi
ValueItem *array = [[ValueItem alloc]init];
[array setValueArray:[outArrayController arrangedObjects]];
// Here, AppDelegate.vi hasn't been initialized, so valueArray *will* be null!
NSArray *testArray2 = vi.valueArray;
NSLog(#"test array 2 is:%#", testArray2);