I do not know why viewForHeaderInSection is not called in swift3

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I don't know why viewForHeaderInSection is not called in swift3. I've added heightForHeaderInSection in UITableView but not called unfortunately. Please help me to check how to fixed it.

func numberOfSectionsInTableView(_ tableView: UITableView) -> Int {
    return 3
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    switch (section) {
    case 0:
        return homeStrs.count
    case 1:
        return accountStrs.count
    case 2:
        return otherStrs.count
    default:
        return otherStrs.count
    }
}

func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {
    let cell = menuTable.dequeueReusableCell(withIdentifier: "MenuCell", for: indexPath) as! MenuCell
    cell.layoutMargins = UIEdgeInsets.zero;
    cell.lbNoti.isHidden = true
    switch ((indexPath as NSIndexPath).section) {
    case 0:
        cell.lbMenuTitle?.text = homeStrs[(indexPath as NSIndexPath).row]
        cell.imgIcon.image = UIImage (named: homeImgStrs[(indexPath as NSIndexPath).row])
    case 1:
        cell.lbMenuTitle?.text = accountStrs[(indexPath as NSIndexPath).row]
        cell.imgIcon.image = UIImage (named: accountImgStrs[(indexPath as NSIndexPath).row])
    case 2:
        cell.lbMenuTitle?.text = otherStrs[(indexPath as NSIndexPath).row]
        cell.imgIcon.image = UIImage (named: otherImgStrs[(indexPath as NSIndexPath).row])
    default:
        cell.lbMenuTitle?.text = "Other"
    }

    return cell
}

func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return 40
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    switch (section) {
    case 1:
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: self.menuTable.frame.size.width, height: 30))
        let menuHeaderLabel = UILabel(frame: CGRect(x: 20, y: 0, width: self.menuTable.frame.size.width, height: 28))
        menuHeaderLabel.text = "Account Settings"
        headerView.addSubview(menuHeaderLabel)
        return headerView
    case 2:
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: self.menuTable.frame.size.width, height: 30))
        let menuHeaderLabel = UILabel(frame: CGRect(x: 20, y: 0, width: self.menuTable.frame.size.width, height: 28))
        menuHeaderLabel.text = "Others"
        headerView.addSubview(menuHeaderLabel)
        return headerView
    default:
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: self.menuTable.frame.size.width, height: 0))
        return headerView
    }
}


You sure you've added UITableViewDelegate, UITableViewDataSource in your ViewController Class