UITableViewCell with images in different dimensions - objective-c

Question

I'm trying to use my ReusableCell for cells with images in different dimensions. The images are put inside a 220x150 black box with with scaling UIViewContentModeScaleAspectFit.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"NewsTableViewCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NewsItem *item = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:item.imageUrl]];
[cell.imageView setImage:[[UIImage alloc] initWithData:data]];
[cell.imageView setBackgroundColor:[UIColor blackColor]];
[cell.imageView setContentMode:UIViewContentModeScaleAspectFit];
CGRect imageViewFrame = cell.imageView.frame;
imageViewFrame.size.width = 220;
imageViewFrame.size.height = 150
[cell.imageView setFrame:imageViewFrame];
[cell.textLabel setText:item.title];
return cell;
}
The above code results in a layout like below and the images are sometimes changing when scrolling in the table view.
Instead of this unstructured layout, I would like the images to be aligned like this:
What am I doing wrong with this ReusableCell?
EDIT1:
I'm trying to create an imageView and add this imageView as a superview to cell.contentView.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"NewsTableViewCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NewsItem *item = [self.fetchedResultsController objectAtIndexPath:indexPath];
UIImage *placeholderImage = [UIImage imageNamed:#"ImagePlaceholderThumb"]; //220x150
UIImageView *imageView = [[UIImageView alloc] initWithImage:placeholderImage];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:item.imageUrl]];
[imageView setImage:[[UIImage alloc] initWithData:data]];
[imageView setBackgroundColor:[UIColor blackColor]];
[imageView setContentMode:UIViewContentModeScaleAspectFit];
CGRect imageViewFrame = imageView.frame;
imageViewFrame.size.width = placeholderImage.size.width;
imageViewFrame.size.height = placeholderImage.size.height;
[imageView setFrame:imageViewFrame];
[cell.contentView addSubview:imageView];
[cell.textLabel setText:item.title];
return cell;
}
The above code results in the following:
It is like some of the images are visible in two cells. It seems that they are not keeping the size I've set in the imageViewFrame. Do you know why?

Answer 1

A quick fix would be using content mode UIViewContentModeScaleAspectFill. Images will be stretched in one or both dimensions to fill up the whole image view bounds.
You really need subclassing UITableViewCell to do this right.
Thre is a lazy solution adding a new UIImageView and using a spacer, as Keller told you in his answer (feel free to accept his answer, this is just the missing code).
Extract of tableView:cellForRowAtIndexPath::
...
cell.textLabel.text = [NSString stringWithFormat:#"Cell #%i", indexPath.row];
cell.imageView.image = [UIImage imageNamed:#"spacer.png"]; /* spacer is 64 x 44 */
/* image view width should be ~ 64 px, otherwise it will overlap the text */
UIImageView *iv = [[UIImageView alloc] initWithFrame:(CGRect){.size={64, tableView.rowHeight}}];
switch (indexPath.row) {
case 0:
iv.image = [UIImage imageNamed:#"waterfall.png"];
break;
/* etc... */
}
if (indexPath.row < 3) {
/* add black bg to cell w/ images */
iv.backgroundColor = [UIColor blackColor];
}
iv.contentMode = UIViewContentModeScaleAspectFit;
[cell.contentView addSubview:iv];
...
The table will look like this:
You need to set the placeholder (spacer.png above) in the existing cell image view. It will push the text label to the right.
You can use aspect fill and remove the background color bit:
iv.contentMode = UIViewContentModeScaleAspectFill;
The table will look wrong because the image is drawn outsite the bounds:
Just clip to bounds to get a better result:
iv.clipsToBounds = YES;

Answer 2

Create a UIImageView subview for each cell and it to the contentView. Each UIImageView contains an image with a consistent frame but with option UIViewContentModeScaleAspectFit. Then just Set the background color of the UIImageView to black.
I just confirmed this works, but you need to also create a placeholder spacer image to make sure the textLabel moves out of the way. Just make it the same dimensions of your image (with the letter boxing).
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
//spacer
cell.imageView.image = [UIImage imageNamed:#"placeholder"];
//imageview
UIImageView *thumbnail = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80, 44)];
thumbnail.tag = kThumbTag;
thumbnail.backgroundColor = [UIColor blackColor];
thumbnail.contentMode = UIViewContentModeScaleAspectFit;
[cell.contentView addSubview:thumbnail];
}
// Configure the cell...
cell.textLabel.text = [NSString stringWithFormat:#"Cell %d", indexPath.row];
cell.imageView.frame = CGRectMake(0, 0, 80, 44);
UIImageView *thumb = (UIImageView*)[cell.contentView viewWithTag:kThumbTag];
if (indexPath.row == 0) {
[thumb setImage:[UIImage imageNamed:#"image1.png"]];
} else {
[thumb setImage:[UIImage imageNamed:#"image2.png"]];
}
return cell;
}
Obviously, this example isn't lazy loading the images (I didn't realize you were loading them from a URL). For that, I would use a subclass with EGOImageView or something of the like.