UITableViewCell Separator disappearing in iOS7

Did you try adding a UIView of height 1 in the header and the footer of the table with light gray background color? Basically it'll mock the first and last separators.

I also had the problem with missing separator and I found out that the problem only occured when heightForRowAtIndexPath was returning a decimal number. Solution:

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return ceil(yourHeight) // Ceiling this value fixes disappearing separators
}

I dumped the subview hierarchy of affected cells and found that the _UITableViewCellSeparatorView was set to hidden. No wonder it's not shown!

I overrode layoutSubviews in my UITableViewCell subclass and now the separators are displayed reliably:

Objective-C:

- (void)layoutSubviews {
    [super layoutSubviews];

    for (UIView *subview in self.contentView.superview.subviews) {
        if ([NSStringFromClass(subview.class) hasSuffix:@"SeparatorView"]) {
            subview.hidden = NO;
        }
    }
}

Swift:

override func layoutSubviews() {
    super.layoutSubviews()

    guard let superview = contentView.superview else {
        return
    }
    for subview in superview.subviews {
        if String(subview.dynamicType).hasSuffix("SeparatorView") {
            subview.hidden = false
        }
    }
}

The other solutions proposed here didn't work consistently for me or seem clunky (adding custom 1 px footer views).

This worked for me:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // fix for separators bug in iOS 7
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;