iOS: UIImageView in UITableViewCell can be changed? why I was failed?

I met the same question as iOS: UIImageView changes with change in UITableView.rowHeight, how to avoid? described, of course, in SO, there were many Q/As like this, and I tried many answers, but I did not get the right result:

(1) when in ...cellForRowAtIndexPath...:

 NSString *CellIdentifier = [menuItems objectAtIndex:indexPath.row];
NSString *CellLabel = [menuLabels objectAtIndex:indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
cell.textLabel.text = CellLabel;
tableView.rowHeight = 43;

 UIImage* im = [UIImage imageNamed: @"news"];
cell.imageView.image = im;

I got the following:

(2) I tried the above answer: based on (1)'s code, I added:

UIGraphicsBeginImageContextWithOptions(CGSizeMake(32,32), YES, 0);
[im drawInRect:CGRectMake(0,0,32,32)];
UIImage* im2 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
cell.imageView.image = im2;
cell.imageView.contentMode = UIViewContentModeCenter;

I got another strange picture: