Question

So following Apple’s DocInteraction Sample here I put a static NSString to define some preloaded documents. Now I need to load them into an NSArray in the viewDidLoad method. If I put it into a for() statement, it says “expression result unused”, and I know I could solve it by using documents[indexPath.row], but it’s the viewDidLoad method. So how do I forEach a static NSString for loading into the NSArray?

CODE (EDIT):

//Before @implementation

static NSString* documents[] =
{   @"Musette.pdf",
    @"Minore.pdf",
    @"Cantata.pdf",
    @"Finalé.pdf"
};
//In viewDidLoad

    if ( _icons == nil )
{        

    _icons = [[NSMutableArray alloc] init];
    UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(0, 0, 200.0, 324.0)
                                                     cornerRadius: 18.0];
    for (NSUInteger i = 1; i <= 4; i++){

        UIGraphicsBeginImageContext( CGSizeMake(200.0, 324.0) );

        // clear background
        [[UIColor clearColor] set];
        UIRectFill( CGRectMake(0.0, 0.0, 200.0, 324.0) );

        // fill the rounded rectangle
        [path fill];

        UIImage *image = [UIImage imageNamed:@"ClearImage.png"];

        UIGraphicsEndImageContext();

        // put the image into our list
        [_icons addObject: image];
    }
}

[_gridView reloadData];

Answer 1

C-arrays are not supported by the for-each modification of the for statement in Objective-C. So you have 2 choices here:

1. use ordinary for-statement cycle

   for(int idx = 0; idx < KNOWN_DOCUMENTS_COUNT; ++idx) {
   …
   }

2. Create a custom subclass of the NSEnumerator and use it… however, I believe, this will be a big overhead for this case