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我试图在此文本下划线UIButton （“隐私政策”）。如何做到这一点？这是我的代码：

var PrivacyPolicy = new UIButton(new CGRect(10, s.MxHt - 40, (s.MxWd - 20) / 3, 30));

PrivacyPolicy.BackgroundColor = UIColor.FromRGB(0, 92, 191);
PrivacyPolicy.Font = UIFont.FromName("Roboto", 14f);
PrivacyPolicy.SetTitle("Privacy Policy", UIControlState.Normal);
PrivacyPolicy.TouchUpInside += HandleBtnOpenPrivacyTouchUpInside;            

if (iPad == false)
{
    PrivacyPolicy.Font = UIFont.SystemFontOfSize(12);
}

View.AddSubview(PrivacyPolicy);