How to find actual number of lines of UILabel?

Question

How can I find the actual number of lines of a UILabel after I have initialized it with a text and a font? I have set

Answer 1

Xamarin.iOS

Thanks to the answers everyone provided above.

This gets number of visible lines.

public static int VisibleLineCount(this UILabel label)
{
    var textSize = new CGSize(label.Frame.Size.Width, nfloat.MaxValue);
    nfloat rHeight = label.SizeThatFits(textSize).Height;
    nfloat charSize = label.Font.LineHeight;
    return Convert.ToInt32(rHeight / charSize);
}

This gets actual number of lines the text will occupy on screen.

public static int LineCount(this UILabel label)
{
    var maxSize = new CGSize(label.Frame.Size.Width, nfloat.MaxValue);
    var charSize = label.Font.LineHeight;
    var text = (label.Text ?? "").ToNSString();
    var textSize = text.GetBoundingRect(maxSize, NSStringDrawingOptions.UsesLineFragmentOrigin, new UIStringAttributes() { Font = label.Font }, null);
    return Convert.ToInt32(textSize.Height / charSize);
}

A helper method I find useful for my use case.

public static bool IsTextTruncated(this UILabel label)
{
    if (label.Lines == 0)
    {
        return false;
    }
    return (label.LineCount() > label.Lines);
 }

To get a more accurate line count:

• Use font.lineHeight instead of font.pointSize
• round() the line count after division