UIFont.monospacedDigitSystemFontOfSize() not really monospaced?

Question

I wanted to use SF's monospaced digits font to display an integer number in a text field by changing its font as follows:

textField.font = UIFont.monospacedDigitSystemFont(textField.font!.pointSize, weight: UIFont.Weight.semibold)

But if I set the text of the text field in a 60Hz frequency, this is the result:

The width of the text is clearly not constant for a same amount of digits so it is moving all jittery because the text field is constrained to "leading" and "trailing" of the image underneath. Why is this the case and how to fix it?

Another truly monospaced font like "Menlo" is behaving correctly:

Answer 1

So it seems like setting the "adjust to fit" option of the text field is overwriting the monospaced property of the font (even if the view is big enough to contain the text!)

My temporary solution at this point is to

• Set textField.adjustsFontSizeToFitWidth to false
• Set the monospaced font again (as it was somehow overwritten by adjustsFontSizeToFitWidth's setter)
• Begin to change the text
• When finished set textField.adjustsFontSizeToFitWidth to true again in order to correctly behave on user input

This is not what I originally wanted but it works as a workaround