添加附件類型移動標籤在UITableViewCell

我想創建一個單選按鈕;不過，我正在使用UITableView。我有以下代碼：添加附件類型移動標籤在UITableViewCell

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
    let cell = UITableViewCell(style: .Default, reuseIdentifier: "sortcell") 
    if indexPath.row == 0 { 
     cell.textLabel?.text = "Student" 
    } else { 
     cell.textLabel?.text = "Teacher" 
    } 
    cell.textLabel?.textAlignment = .Center 
    cell.textLabel?.font = getFont(17.5) 
    return cell 
} 

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    return 2 
} 

var selectedIndexPath = 10 

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 
    selected = true 

    if indexPath.row == 0 { 
     sort = "Student" 
     let cell = sortTable.cellForRowAtIndexPath(indexPath) 
     cell?.accessoryType = .Checkmark 
     let otherIndexPath = NSIndexPath(forRow: 1, inSection: 0) 
     let otherCell = sortTable.cellForRowAtIndexPath(otherIndexPath) 
     otherCell?.accessoryType = .None 
    } else { 
     sort = "Teacher" 
     let cell = sortTable.cellForRowAtIndexPath(indexPath) 
     cell?.accessoryType = .Checkmark 
     let otherIndexPath = NSIndexPath(forRow: 0, inSection: 0) 
     let otherCell = sortTable.cellForRowAtIndexPath(otherIndexPath) 
     otherCell?.accessoryType = .None 
    } 

    sortTable.deselectRowAtIndexPath(indexPath, animated: true) 

}

這允許用戶在選擇他或她是學生還是教師之間切換。然而，當加入accessoryType，文本標籤輕微移動，如圖所示：

默認：