Question

I am trying to load locally stored images in a background thread and set them as UITableViewCell images. I keep getting an exception and don’t really know how to approach it.

Here is my code:

- (void)loadImageInBackground:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

NSString *path = [[tableImages objectAtIndex:indexPath.section]objectAtIndex:indexPath.row];

UIImage *img = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:path ofType:@"png"]];

[self performSelectorOnMainThread:@selector(assignImageToImageView:) withObject:img waitUntilDone:YES];

[img release];  
[pool release];
}

- (void) assignImageToImageView:(UIImage *)img
{

UITableViewCell *cell = (UITableViewCell *)[self.tableView viewWithTag:0];

((UIImageView *)cell.imageView).image = img;
}

Anyone have any ideas? Thanks to all!

Answer 1

As is mention in your error you are trying to set image to object of class UITableView. It is impossible.

In your code it is error here:

UITableViewCell *cell = (UITableViewCell *)[self.tableView viewWithTag:0];

By default all views has default view tag set to 0. When your are calling that method to your tableView it returns you first UIView with tag == 0. I think you didn’t change default tag of your UITableView *tableView so that method returns you tableView and not UITableViewCell.

In this case, you need to choose right way to access appropriate UITableViewCell *cell;.