Question

I am attempting to copy an array in my ViewController to a Data storage class. None of the array copy methods I have found are actually working. Currently I have..

   //XML parser is returning an array of parsed objects
    NSMutableArray *randomtesting = [parser listArray];
    customerList.list =[[NSMutableArray alloc] initWithArray:randomtesting copyItems:YES];

    NSLog(@"First node randomtesting: %@",[randomtesting objectAtIndex:0]);
    NSLog(@"First node customerList: %@",[customerList.list objectAtIndex:0]);

The first NSLog prints out the value correctly. The second prints out a Null. I have also tried

customerList.list =randomtesting;

and

customerList.list = [paser listArray];

The .h of my Viewcontroller for this class is as follows

#import <UIKit/UIKit.h>


@class CustomerListData;

@interface ViewController : UIViewController <UIAlertViewDelegate, UITextFieldDelegate>{

    CustomerListData *customerList;

}


@property (nonatomic, retain) CustomerListData *customerList;

The class’s .h of the array variable is

 #import <Foundation/Foundation.h>

 @interface CustomerListData : NSObject{

   NSMutableArray *list;
 }


 @property (nonatomic, retain) NSMutableArray *list;

 @end

the .m is just

@synthesize list;

I believe all of my variable declarations are correct, I’m just not copying it correctly. But I none of the methods seem to work.

Thanks.

Answer 1

Are you initializing your ViewController’s customerList property anywhere i.e. doing something like this:

self.customerList = [[[CustomerListData alloc] init] autorelease];

If not, then this property will be nil and all your attempts at accessing the customerList.list child property will fail silently because you are sending an Objective-C message to nil.