Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Build a Simple iPhone App with Objective-C Creating a Data Model Creating a Data Collection

Matthew Jennings
Matthew Jennings
6,545 Points

In Task 2 of the code challenge for Build a Simple iPhone App with Objective-C, the preview is not working.

I believe the answer here is NSArray *shoppingList = [[NSArray alloc] initWithObjects:@"toothpaste", @"bread", "eggs", nil]; but it's not letting me past it and no help given. The video preceeding this challenge did exactly this?

ViewController.h
#import "UIViewController.h"

@interface ViewController : UIViewController

@property (strong, nonatomic) NSString *shoppingCart;
@property (strong, nonatomic) NSArray *shoppingList;

@end
ViewController.m
#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Add your code below!
    NSArray *shoppingList = [[NSArray alloc] initWithObjects:@"toothpaste", @"bread", @"eggs", nil];
}

@end

2 Answers

Ocky Wiemeijer
Ocky Wiemeijer
5,451 Points

In your ViewController implementation file you need to use self.shoppingList to initialize the array, instead of declaring it with 'NSArray *shoppingList'. You already did that in the header file. You simply have to refer to the 'property' shoppingList of the main view and allocate memory for it and initialize it.

so it should be:

self.shoppingList = [[NSArray alloc] initWithObjects:@"toothpaste", @"bread", @"eggs", nil];