Question

In an NSObject subclass declaration is an array:

    @interface theClass : NSObject {
        NSMutableArray *myArray;
    }
    ...

    @end

In the implementation’s initializer:

    - (id)init
    {
        self = [super init];
        if (self) {
            [myArray initWithCapacity:50];
        }

    return self;
    }

And in a method:

- (NSMutableArray *)theMethod:(NSArray *)someArray {
    ...
    ...

    [myArray addObject:anObject];
    ...

    return myArray;
}

Yet despite the class being instantiated in my controller, any number of messages to the method leave myArray without contents.

Answer 1

You haven’t allocated the array yet. Replace your init code with the following:

  - (id)init
    {
        self = [super init];
        if (self) {
            myArray = [[NSMutableArray alloc] initWithCapacity:50];
        }

    return self;
    }