Question

I am initializing a view controller with a NSMutableArray. But in init, I have to init with NSMutableArray, but all the elements disappeared after that.

UIViewController* vc = [[[PhotoAlbumViewController alloc] initWithImages:imageArrayBig] autorelease];

Below is the definition of the function above.

// This is the definition of the init function
- (id)initWithImages:(NSMutableArray *)bigImages {

    if ((self = [self initWithNibName:nil bundle:nil])) {
        _imageArrayBig = [[NSMutableArray alloc] init];
        for (ArrayObject* tmp in bigImages) {
            [_imageArrayBig addObject: tmp];
        }
    }
    // After the copying, all the elements in bigImages and _imageArrayBig disappear :(
    return self;
}

Any idea? Is there a memory leak?

Answer 1

It looks like you are mixing the property name with the instance name since you use both imageArrayBig and _imageArrayBig.

It is better to stick with one, preferably self.imageArrayBig which is the property

You can also copy the array more effectively by using addObjectsFromArray

something like

NSMutableArray* tmp = [[NSMutableArray alloc] init];
[tmp addObjectsFromArray:bigImages];
self.imageArrayBig = tmp;
[tmp release];