Question

I have a UITableView whose controller looks like this:

@interface FLWorkspaceViewController : UITableViewController

@property(nonatomic,retain) NSMutableArray* workspaces;

@end

I try to set that array in another controller:

for(NSDictionary* workspace in workspaces)
        {
            NSLog(@"%@",workspace);
            [workspaceViewController.workspaces addObject:workspace];
        }

        [self.navigationController pushViewController:workspaceViewController animated:YES];

I’ve checked the values and they exist. When I count workspaces in viewDidLoad, it’s 0. Why is this?

Answer 1

@property statements create the pointers for you, but not the actual content. Since I don’t see it in your code: Do you alloc init your NSMutableArray *workspaces somewhere?

EDIT: Probably the best way to initialise your workspaces array would be in a getter method in the class where you define the @property. Lazy initialisation is preferrable. Best amend your @synthesize statement to read something like @synthesize workspaces = i_workspaces;, then you can write your getter like this:

- (NSMutableArray *)workspaces {
    if (i_workspaces == nil) {
        NSMutableArray *i_workspaces = [[NSMutableArray alloc] initWithCapacity:3];
    }
    return i_workspaces;
}

The capacity statement just helps the compiler optimise, it doesn’t have to be exact.