UITextView Font size set programmatically

Question

I want my UITextView font size to fill the width of the view.

So if I have the text:

"I wish I \n
knew what \n
I was doing"

I would hope it would expand to be a good size for the width of the device.

UILabels have adjustsFontSizeToFitWidth but if I make a separate label for each line then the font sizes will be different because the strings are different lengths.

How do I pick the right size programmatically?

You'll have to calculate the needed font size so the text meets the desired width. — rmaddy
– rmaddy, Commented Sep 16, 2015 at 3:49
I may be wrong, being only young in The Force; but isn't Attributed Text meant to deal with these very issues? — aremvee
– aremvee, Commented Mar 5, 2016 at 23:57

Dharmesh Kheni · Accepted Answer · 2015-09-16 04:01:09Z

3

Try this code:

extension UITextView {
    func increaseFontSize () {
        self.font =  UIFont(name: self.font.fontName, size: self.frame.size.height / 4)!
    }
}

This extension will set font size of textView according to your textView's height.

And you can use it this way:

textV.increaseFontSize()

Hope it helps.

answered Sep 16, 2015 at 4:01

Dharmesh Kheni

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1 Comment

rmaddy Over a year ago

I'm not sure why this was accepted. Shouldn't the calculation be based on the text in the text view, in addition to the text view's width? I thought the idea was to size the font so the text filled the text view's width.

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