Changing specific row in table from void - ios

Question

I have a populated TableView where i would like to change the image. When I'm inside cellForRowAtIndexPath I can change it by using:
cell.imageView.image = [UIImage imageNamed:#"image.png"];
But I cannot figure out how to do the same thing inside the void, I have tried:
[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0]].imageView.image = [UIImage imageNamed:#"image.png"];
But it doesn't change the image at all.
Thanks,
/DSDeniso
EDIT:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
_row = indexPath.row;
[self changeImage];
}
- (void)changeImage{
UITableViewCell * cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:_row inSection:0]];
if(cell)
{
cell.imageView.image = [UIImage imageNamed:#"image.png"];
} else {
NSLog( #"why is cell null? Did I set row properly?");
}
}

Answer 1

Just pass the cell to the method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
_row = indexPath.row;
[self changeImageForCell:cell];
}
- (void)changeImageForCell:(UITableViewCell*)cell{
cell.imageView.image = [UIImage imageNamed:#"image.png"];
}