Why can't I set the font of a Phrase (or Paragraph)?

问题

I'm starting with itextsharp and wondering if there is any reason why if I set the font of a phrase after the construction it doesn't work. Is there any reason, do I miss something?

 iTextSharp.text.Font f = PdfFontFactory.GetComic();
 f.SetStyle(PdfFontStyle.BOLD);
 Color c = Color.DarkRed;
 f.SetColor(c.R,c.G,c.B);
 f.Size = 20;
 Document document = new Document();
 try
 {
    PdfWriter.GetInstance(document, new System.IO.FileStream("PhraseTest.pdf",   FileMode.Create));
    document.SetPageSize(PageSize.A4);
    document.Open();
    Phrase titreFormules = new Phrase("Nos formules",f); //THIS WORKS
    // titreFormules.Font = f; // THIS DOESN'T WORK!
    document.Add(titreFormules);
    document.Close();

回答1:

This is documented in my book.

A Chunk is an atomic part of text in the sense that all the text in a Chunk has the same font family, font size, font color,...
A Phrase is a collection of Chunk objects and as such a Phrase can contain different 'atoms' of text using different fonts.

In your example "Nos formules" will be written in Helvetica. You change the font after the Helvetica Chunk with the text "Nos formules" was added to the Phrase.As you didn't add anything else to titreFormules, the font "Comic" is never used.

This is also what I meant when I answered the question iText - PdfPTable doesn't show Cyrillic(Russian) symbols:

When you use setFont(), you change the font of the Phrase for all the content that is added after the font was set.

来源：https://stackoverflow.com/questions/25793034/why-cant-i-set-the-font-of-a-phrase-or-paragraph

标签

fonts

itext

phrase