Get UILabel font pointsize after minimumFontSize

Question

I have a UILabel with a font of point size 17. If I call label.font.pointSize I get 17, which is all good. BBUUUUTTT I also have a minimumfontsize set to 8, now if I cram some text in the label which causes the point size to shrink and then call label.font.pointsize I still get 17 even though I know the point size is smaller

Any ideas how to get the true point size after system has resized the font?

Not directly but you can calculate it. See the first answer here: http://stackoverflow.com/questions/3669844/how-to-get-uilabel-uitextview-auto-adjusted-font-size — savner, Jun 04 '13 at 16:32
It's annoying because `UILabel` does have the information in a private property called `_scaledMetrics` which is an instance of `_UILabelScaledMetrics`. That class has a `_actualScaleFactor` property. But all academic as it's not publicly available. — ChrisH, Dec 21 '16 at 19:34

score 4 · Answer 1 · answered Jun 04 '13 at 16:33

I don't know of an API to get the current point size of the UILabel when it is scaling your content down. You can try to approximate "scaling factor" using sizeWithFont APIs.

Just an idea:

// Get the size of the text with no scaling (one line)
CGSize sizeOneLine = [label.text sizeWithFont:label.font];

// Get the size of the text enforcing the scaling based on label width
CGSize sizeOneLineConstrained = [label.text sizeWithFont:label.font constrainedToSize:label.frame.size];

// Approximate scaling factor
CGFloat approxScaleFactor = sizeOneLineConstrained.width / sizeOneLine.width;

// Approximate new point size
CGFloat approxScaledPointSize = approxScaleFactor * label.font.pointSize;

score 2 · Accepted Answer · edited May 23 '17 at 12:08

2

As savner pointed out in the comments, this is a duplication question. The cleanest solution is found here: How to get UILabel (UITextView) auto adjusted font size?. However, Sanjit's solution also works! Thanks Everybody!

CGFloat actualFontSize;
[label.text sizeWithFont:label.font
         minFontSize:label.minimumFontSize
      actualFontSize:&actualFontSize
            forWidth:label.bounds.size.width
       lineBreakMode:label.lineBreakMode];

edited May 23 '17 at 12:08

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answered Jun 04 '13 at 21:16

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Can anyone translate this solution into Swift? – Narwhal Jul 04 '15 at 20:31
@Narwhal My solution for Swift is to create a subclass or category in Objective-C and use it in Swift. Not recommended, because the method is deprecated, but there is no alternative way to get the actual font size. – Adam Aug 18 '15 at 11:43

score 1 · Answer 3 · answered Oct 05 '17 at 10:42

Swift 4 and iOS 7+ version (sizeWithFont is now deprecated) of @Sanjit Saluja's answer:

// Get the size of the text with no scaling (one line)
let sizeOneLine: CGSize = label.text!.size(withAttributes: [NSAttributedStringKey.font: label.font])

// Get the size of the text enforcing the scaling based on label width
let sizeOneLineConstrained: CGSize = label.text!.boundingRect(with: label.frame.size, options: .usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: label.font], context: nil).size

// Approximate scaling factor
let approxScaleFactor: CGFloat = sizeOneLineConstrained.width / sizeOneLine.width

// Approximate new point size
let approxScaledPointSize: CGFloat = approxScaleFactor * label.font.pointSize

Get UILabel font pointsize after minimumFontSize

3 Answers3