I have a UIImageView on each of my UITableView cells, that display a remote image (using SDWebImage). I\'ve done some QuartzCore
Simply set the cornerRadius to half of the width or height (assuming your object's view is square).
For example, if your object's view's width and height are both 50:
itemImageView.layer.cornerRadius = 25;
Update - As user atulkhatri points out, it won't work if you don't add:
itemImageView.layer.masksToBounds = YES;