I subclassed UITableViewCell. Then, in my storyboard, I added an image to the superview. The image has constraints of:
Since the separator view and cell's content view are at the same level in the view hierarchy you could use
bringSubviewToFront to display the content view over the separator, however this might cover it if you use a background color for the
contentView. All you have to do is set
cellForRowAtIndexPath. If this does not suit your needs you can always implement your own custom cell with a custom separator.