I'm trying to apply some labeling properties to a layer using Python. Everything went fine, except the way I tried to apply the Bold and Italic settings. Here is a part of the code:

  layer.setCustomProperty("labeling/fieldName", field.name())
  layer.setCustomProperty("labeling", "pal")
  layer.setCustomProperty("labeling/enabled", "True")
  layer.setCustomProperty("labeling/fontFamily", "Arial Narrow")

  if self.dlg.pt6.isChecked():
    layer.setCustomProperty("labeling/fontSize", "6")
  if self.dlg.pt8.isChecked():
    layer.setCustomProperty("labeling/fontSize", "8")
  if self.dlg.pt10.isChecked():
    layer.setCustomProperty("labeling/fontSize", "10")

  if self.dlg.chkbold.isChecked():
    layer.setCustomProperty("labeling/weight", "Bold")
    layer.setCustomProperty("labeling/fontWeight", "75")
    layer.setCustomProperty("labeling/Weight", "Bold")

  if self.dlg.chkitalic.isChecked():
    layer.setCustomProperty("labeling/fontItalic", "True")
  • Have you tried using 75 instead of "75" and True instead of "True"? Also, I believe "labeling/weight" isn't supported (only "labeling/fontWeight"). – ArMoraer Apr 29 '16 at 8:11
  • Thanks. I think removing the quotes is a good idea. Unfortunately, this doesn't solve the problem. – Steven Apr 29 '16 at 8:22
  • 1
    Great! This works. – Steven May 5 '16 at 18:52
  • Just posted my comment as an answer. Great that you've solved the problem. – Germán Carrillo May 6 '16 at 13:21

It seems that it depends on the font you're using. Try alternating among the following options:


layer.setCustomProperty("labeling/namedStyle", "Bold")


layer.setCustomProperty("labeling/namedStyle", "Italic")

Bold and Italic:

layer.setCustomProperty("labeling/namedStyle", "Bold Italic")

If neither Bold or Italic are selected in your plugin, you could use:

layer.setCustomProperty("labeling/namedStyle", "Regular")

These options correspond to styles in the QGIS GUI:

enter image description here

This should do the trick!

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