ios - 如何在 Xamarin iOS 中为标题添加下划线

Question

我想在 xamarin iOS 中的按钮文本下划线，我有一个名为的样式

    public static UIButton StyleLinkButtonBlack(this UIButton button)
    {
        button.Font = Styles.SetOpenSansSemiboldFont(Dimensions.medium);
        button.LineBreakMode = UILineBreakMode.WordWrap;
        button.SetTitleColor(UIColor.Black, UIControlState.Normal);     
        button.TitleLabel.TextAlignment = UITextAlignment.Center;

        return button;
    }

我怎样才能做到这一点？

Answer 1

只需要添加一个 NSMutableAttributedString，就像这样

var attrString = new NSMutableAttributedString(button.TitleLabel.Text);
attrString.AddAttribute(UIStringAttributeKey.UnderlineStyle,NSNumber.FromInt32((int)NSUnderlineStyle.Single),new NSRange(0, attrString.Length));
button.TitleLabel.AttributedText = attrString;