Rounded corners in a UITableView (iOS7)

Your UITableview contains UIView, so just use this below lines of code for making it rounded corners.
Also write this below line of code inside your tableview methods

//If iOS version < 10

For Objective-C:

cell.contentView.layer.cornerRadius = 5;
cell.contentView.layer.masksToBounds = YES;

For Swift:

cell.contentView.layer.cornerRadius = 5
cell.contentView.layer.masksToBounds = true

//If iOS version >= 10

For Objective-C:

cell.layer.cornerRadius = 5;
cell.layer.masksToBounds = YES;

For Swift:

cell.layer.cornerRadius = 5
cell.layer.masksToBounds = true

Note: No need to import QuartzCore framework explicitly.