public static NSMutableAttributedString?WithCharacterSpacing(this NSAttributedString attributedString, double characterSpacing)
{
if (attributedString == null || attributedString.Length == 0)
{
return(null);
}
var attribute = attributedString.GetAttribute(UIStringAttributeKey.KerningAdjustment, 0, out _);
// if we are going to un-set, but there is no adjustment, then bail out
if (characterSpacing == 0 && attribute == null)
{
return(null);
}
var mutableAttributedString = new NSMutableAttributedString(attributedString);
mutableAttributedString.AddAttribute
(
UIStringAttributeKey.KerningAdjustment,
NSObject.FromObject(characterSpacing),
new NSRange(0, mutableAttributedString.Length)
);
return(mutableAttributedString);
}
public static NSMutableAttributedString?WithLineHeight(this NSAttributedString attributedString, double lineHeight)
{
if (attributedString == null || attributedString.Length == 0)
{
return(null);
}
var attribute = (NSParagraphStyle)attributedString.GetAttribute(UIStringAttributeKey.ParagraphStyle, 0, out _);
// if we need to un-set the line height but there is no attribute to modify then we do nothing
if (lineHeight == -1 && attribute == null)
{
return(null);
}
var mutableParagraphStyle = new NSMutableParagraphStyle();
if (attribute != null)
{
mutableParagraphStyle.SetParagraphStyle(attribute);
}
mutableParagraphStyle.LineHeightMultiple = new nfloat(lineHeight >= 0 ? lineHeight : -1);
var mutableAttributedString = new NSMutableAttributedString(attributedString);
mutableAttributedString.AddAttribute
(
UIStringAttributeKey.ParagraphStyle,
mutableParagraphStyle,
new NSRange(0, mutableAttributedString.Length)
);
return(mutableAttributedString);
}
