Excel公式不会自动更新

Question

I have created a simple excel formula to know what is the color of the font of the cell A1

Function GetFontColorIndex(elrango As Range) As Integer
        Application.Volatile
       GetFontColorIndex = elrango.Cells(1, 1).Font.ColorIndex
End Function

In excel-2010 :
File > Options > Formulas > Workbook Calculation > Automatic is checked

In cell A1 I have a number, and in cell A3 I have
=GetFontColorIndex(A1)

but when I change the font of cell A1 , the formula does not update automatically on cell A3 . I have to click shift+F9 and then it works.

Any idea why is not showing the number of the font automatically?

Answer 1

As simoco has mentioned.

If you are using your 'udf' in Sheet1 then in the module associated with that sheet add the following:

If you just change the colour the formula does not update but as soon as you press enter or select another cell in the sheet it updates