使用NSAttributedString设置字体

Question

尝试使用NSAttributedString更改pickerView中的字体：

public func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
    guard let castDict = self.castDict else {
        return nil
    }
    let name = [String](castDict.keys)[row]
    switch component {
    case 0:
        return NSAttributedString(string: name, attributes: [NSForegroundColorAttributeName : AppColors.Rose.color, NSFontAttributeName : UIFont.boldSystemFont(ofSize: 14)])
    case 1:
        guard let character = castDict[name] else {
            return NSAttributedString(string: "Not found character for \(name)", attributes: [NSForegroundColorAttributeName : AppColors.Rose.color, NSFontAttributeName : UIFont.boldSystemFont(ofSize: 14)])
        }
        return NSAttributedString(string: character, attributes: [NSForegroundColorAttributeName : AppColors.LightBlue.color, NSFontAttributeName : UIFont.boldSystemFont(ofSize: 14)])
    default:
        return nil
    }
}

颜色已更改，字体-不是：

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我做错了什么？