Only loading 36 Images [Bug] about gmgridview

[mwyman]

The point of the datasource method is to recycle the cell views. You're only setting the image at the time you first create the cell, so I'd completely expect that when you scroll far enough to recycle cells, they'll show the old images.

Your code should be more like:

GMGridViewCell *cell = [gridView dequeueReusableCell];
if ( !cell ) {
    cell = [[GMGridViewCell alloc] init];

    cell.contentView = [[UIImageView alloc] init];
}

NSString *imageName = [NSString stringWithFormat:@"%@.png", [_data objectAtIndex:index]];
[(UIImageView *)cell.contentView setImage:[UIImage imageNamed:imageName]]

return cell;

Also, the [[cell.contentView subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)] probably isn't needed (and wasn't doing anything in your example, as it has no subviews of cell.contentView), and not wanted, since you should reset the contents of your cell views, not recreate them every time...

[gmoledina]

Thanks for your explanation @mwyman !

[acecapades]

Hello,

I'm also using GMGridView which is fantastic for supporting grid views. But I'm encountering problems regarding the way it dequeues cells.

Some background info on my app: I have a class named 'ProductsGVC' which presents a grid view of products belonging to a certain 'Category'. ProductsGVC's data model is an array of products taken from an instance of a 'Category'.

My GMGridView creates 250 cells at a time. As I load each cell, I have a thread that downloads an image for each cell. While waiting for it to finish downloading, I put a default image in the cell's image view. Logically, after downloading the cell, I want to reload the cell to update the photo. I'm successful at doing this using this code:

//_currentData is my array of products
[_gmGridView reloadObjectAtIndex:[_currentData indexOfObject:product] animated:YES];

However, if the a cell that is in the bottom part of my array is updated, the cell is refreshed properly but 1 cell disappears.

My inefficient solution is to call [_gmGridView reloadData] anytime a cell finishes downloading its image. The result is, the cells I've loaded before, disappear. I'm guessing their dequeued and reused. Well, they do appear again when I scroll a number of times away from those cells that disappeared.

My question is, how do I prevent dequeue-ing a visible cell (i.e. a cell that is currently on-screen)?